Ncert Solutions Of Electricity Class 10th New,Graupner Rc Model Boats Uk,Ez Loader Bass Boat Trailers - For Begninners
05.03.2021, adminSo it ncert solutions of electricity class 10th new be good for you if you clear your concepts. Since CBSE class 10 is a board class it is extremely important to understand topics carefully. Latest : Trouble with homework? Post your queries of Maths and Science with step-by-step solutions instantly. Ask Mr AL. A closed and continuous path of electric current is known as the electric circuit.
It consists of electric circuit elements like battery, ncert solutions of electricity class 10th new, etc and electric devices like a switch and measuring devices like ammeters. Ampere A is unit of current. We know that the charge of an electron. Clqss, the number of electrons constituting one coulomb of charge is electrons. Battery, cell or power supply source helps to maintain a potential difference across a conductor.
The potential difference between two points is 1 V means 1 J of work is required to move a charge of amount 1C from one point to. Thus, 6J energy is given to each coulomb of charge passing through a 6 V battery. The resistance of a conductor depends on :. Cross section area of the conductor. The temperature of the conductor.
Nature of material of the conductor. We know that resistance is given as. Resistance is inversely proportional to the area fo cross-section. Thicker the wire more is cross-sectional area resulting in less resistance resulting in more current flow. What change will occur in the current through it? By Ohm's law. Now, the potential difference is reduced to half i. Current flowing is reduced to half.
The resistivity of an alloy is higher than pure metal so alloy does not melt at high temperature. Thus, solutioons of electric toasters and electric irons made of an alloy rather than a pure metal.
Lower the value of resistivity lower will be the resistance for a material of given area and length. If resistance is law current flow will be high when a potential difference is applied across the conductor. From the table, we can observe silver has the lowest resistivity so it is the best conductor. The schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a resistor, an resistor, and a resistor, and a plug key, all connected in series is as shown below :.
What would be the readings in the ammeter and the voltmeter? The diagram is as shown :. The reading of the ammeter is o. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it? Given :. Hence, the resistance of electric iron is In parallel, there is no division of voltage among the appliances so the potential difference across all appliance is equal and sloutions total effective resistance of a circuit can be reduced.
Hence, connecting electrical devices in parallel with the battery is beneficial instead of connecting them in series. Connect all the three resistors in parallel. Answer :. Why does the cord of an electric heater not glow while the heating element does? The heating element of an electric heater is a resistor.
The amount of heat production is given as. The resistance of elements alloys of an electric heater is high. As current flow through this element, it becomes ncert solutions of electricity class 10th new and glows red. The resistance of cord metal like Cu or Al of an electric heater is low.
As current flow through this element, it does not becomes hot and does not ncert solutions of electricity class 10th new red. Compute the heat generated while transferring coulomb ncert solutions of electricity class 10th new charge in one hour through a potential elechricity of 50 V.
Calculate the heat developed in 30 s. The rate at which energy is delivered by a current is power. Power depends on the current drawn by the appliance and the resistance of the appliance. Determine the power of the motor and the energy consumed in 2 h. A piece of wire of resistance is cut into five equal parts.
These parts are then connected in parallel. If the equivalent resistance of this combination isthen the ratio is �. Given: A piece of wire of resistance is cut into five equal parts. Resistance of each part is.
Thus, option D is correct. Which of the following terms does not represent electrical power in a circuit? Purin equation 1. P cannot be. Thus, option B is correct. An electric bulb is rated V and W.
When it is operated on V, the power consumed will be. The resistance of the bulb. If bulb is operated on Vand resistance 10h the samethe power consumed will be P'. Hence, option D is correct. Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be.
Ncert solutions of electricity class 10th new resistors are connected in parallel, the net resistance is given as. If electridity are connected in series, the net resistance is given as. Thus, option C is correct. How is a voltmeter connected in the circuit to measure the potential difference between two points? A voltmeter should be connected in parallel, to measure the potential difference between two points.
A copper wire has a diameter of 0. What will be the length of this wire to make its resistance? How much does the resistance change if the diameter is doubled? We know. If the diameter is doubled. Hence, new resistance is of original resistance. The ncert solutions of electricity class 10th new of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given be low �.
I amperes 0. Plot a graph between Ncert solutions of electricity class 10th new and I and calculate the resistance of that resistor. The plot between voltage and current is as shown ncert solutions of electricity class 10th new. The slope of the line gives resistance R.
When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the sooutions of the resistor. A battery of 9 V is connected in series with resistors of,and respectively. How much current would flow through the resistor?
Hence, All resistors are in series so 0. How many resistors in parallel are required to carry 5 A on a 10tn line? Let x number of resistors are connected in parallel to obtain 44 Ohm equivalent resistance. Hence, 4 resistors of Ohm are connected in parallel to obtain 44 Ohm. Show how you would connect three resistors, each of resistanceso that the combination has a resistance of iii.
Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other elecctricity the two wires of V line if the maximum allowable bcert is 5 A? Let x be the number of bulbs. For x bulbs of resistance Ohm, are connected in parallel to obtain claas Ohm equivalent resistance.
Hence, bulbs of Ohm are connected in parallel to obtain 44 Ohm.
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How much does the resistance change if the diameter is doubled? Answer: If a wire of diameter doubled to it is taken, then area of cross-section becomes four times. Question 7 The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below : Plot a graph between V and I and calculate the resistance of the resistor. Solution: The graph between V and I for the above data is given below.
The slope of the graph will give the value of resistance. Let us consider two points P and Q on the graph. Question 8 When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the resistance of the resistor.
Question 9 A battery of 9V is connected in series with resistors of 0. How much current would flow through the 12 Q resistor? Thus 4 resistors are needed to be connect. The equivalent resistance is. Question 12 Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of V line if the maximum allowable current is 5 A?
What are the currents in the three cases? Solution: i When the two coils A and B are used separately. Solution: i The circuit diagram is shown in figure.
Question 15 Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is V? Calculate the rate at which heat is developed in the heater. Question 18 Explain the following: i Why is tungsten used almost exclusively for filament of electric lamps?
If the area of cross section of a conductor of fixed length is increased, then resistance decreases because there are more free electrons for movement in conductor. So, they do not become too hot on passing electric current. Electric current, potential difference and electric current, Ohms law, Resistance, Resistivity factors on which the resistance of a conductor depends; Series combination of resistors, parallel combination of resistors; and its application on daily life; Heating effect of Electric current, electric Power, Interrelation between P, V, and R.
Formulae Handbook for Class 10 Maths and Science. Page What does an electric circuit mean? Electric circuit is a continuous and closed path made of conducting wires, through which the electric current flows.
It comprises a cell, ammeter, voltmeter, plug key, etc. Define the unit of current. SI unit of electric current is ampere A. Ampere is the flow of electric charges through an area at the rate of one coulomb per second, i.
Question 1: Name a device that helps to maintain a potential difference across a conductor. Answer: Cell or battery eliminator. Question 2: What is meant by saying that the potential difference between two points is 1 V? Question 3: How much energy is given to one coulomb of charge passing through a 6 V battery Answer:.
Question 1: On what factors does the resistance of a conductor depend Answer: Resistance of a conductor depends upon: i Resistivity of the material.
Question 2: Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Question 3: Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value.
Answer: Hence, the current through an electrical component also becomes half of its previous value. Question 4: Why are the coils of electric toasters and electric irons made of an alloy rather than a pure metal Answer: The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons; i The resistivity of an alloy is higher than that of a pure metal.
Question 5: Use the data in Table Question 2: Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor.
What would be the reading in the ammeter and the voltmeter? Question 1: Judge the equivalent resistance when the following are connected in parallel. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current flows through it?
Question 3: What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
Answer: Advantages of connecting electrical devices in parallel:. Answer: a The highest resistance is secured by combining all four coils of resistance in series. Question 1: Why does the cord of an electric heater not glow while the heating element does?
Answer: The cord of an electric heater is made up of metallic wire such as copper or aluminum which has low resistance while the heating element is made up of an alloy which has more resistance than its constituent metals. Question 2: Compute the heat generated while transferring C of charge in one hour through a potential difference of 50 V.
Question 3: An electric iron of resistance 20 Q takes a current of 5 A. Question 1: What determines the rate at which energy is delivered by a current? Answer: Electric power determines the rate at which energy is delivered by a current. Question 2: An electric motor takes 5 A from a V line. Question 1: A piece of wire of resistance R is cut into five equal parts.
Question 2: Which of the following terms does not represent electrical power in a circuit? Question 3: An electric bulb is rated V and W. Question 4: Two conducting wires of same material and of equal lengths and diameters are first connected in series and then parallel in a circuit across the same potential difference.
The ratio of heat produced in series and parallel combinations would be a b c d Answer:. Question 5: How is a voltmeter connected in the circuit to measure the potential difference between two points?
Question 6: A copper wire has a diameter 0. Question 7: The values of the current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below: Plot a graph between V and I and calculate the resistance of that resistor.
Question 8: When a 12 V battery is connected across an unknown resistor, there is a current of 2. Question 9: A battery of 9 V is connected in series with resistors of 0. Answer: Since all the resistors are in series, the same current, 0. Question Several electric bulbs designed to be used on a V electric supply line, are rated 10 W.
Question A hot plate of an electric oven connected to V line has two resistance coils A and B, each of 24 Q resistance, which may be used separately, in series, or in parallel.
Question Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. Question An electric heater of resistance 8 f2 draws 15 A from the service mains 2 hours. Question Explain the following. Answer: a It has high melting point and emits light at a high temperature. Each of them dissipates energy and can withstand a maximum power of 18 W without melting.
Find the maximum current that can flow through the three resistors. Question 2: Should the resistance of an ammeter be low or high?
Give reason. Answer: The resistance of an ammeter should be low so that it will not disturb the magnitude of current flowing through the circuit when connected in series in a circuit.
Question 3: How does use of a fuse wire protect electrical appliances? Answer: The fuse wire is always connected in series with the live wire or electrical devices. If the flow of current exceeds the specified preset value due to some reason, the heat produced melts it and disconnects the circuit or the device from the mains. In this way, fuse wire protects the electrical appliances.
Question 4: What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Answer: The resistance offered by a metallic wire of unit length and unit cross-sectional area is called electrical resistivity.
Hence, when the length of wire is doubled, the resistance becomes double and current decreases to half. Calculate the resistance of the electric lamp. Question 6: Why is parallel arrangement used in domestic wiring? Answer: Parallel arrangement is used in domestic wiring because i Each appliance gets the same voltage as that of the mains supply. Question 7: B 1, B 2 and B 3 are three identical bulbs connected as shown in figure.
When all the three bulbs glow, a current of 3A is recorded by the ammeter A. Answer: i Since B 1 ,B 2 and B 3 are in parallel, the potential difference across each of them will remain same. So when the bulb B 1 gets fused, B 2 and B 3 have the same potential and continues with the same energy dissipated per second, i.
Question 1: Three incandescent bulbs of W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source.
Justify your answer. Will the rest of the bulbs continue to glow in each circuit? Answer: a The bulbs in the two circuits will not glow equally bright as the current through them is not the same.
While the rest of bulbs in parallel circuit will continue to glow without getting disturbed because in parallel combination, current gets additional paths to flow. Question 2: Find out the following in the electric circuit given in figure: Answer: e No difference, since the ammeters are connected in series and same current will pass through them, so reading of both ammeters will be same.
Question 1. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective. Question 2. For the given circuit, name the components which are connected in parallel. Because terminals of the resistance and voltmeter are connected together.
Question 3. A student arranges the following circuit to get equivalent resistance of a series combination of two resistors R 1 and R 2. Which one of the following statements will be true for this circuit [CCE ] a It gives incorrect reading for current I as well as potential difference V b It gives correct reading for current I but incorrect reading for potential difference V c It gives correct reading for potential difference V but incorrect reading for current I d It gives correct reading for both I and V Answer: b The voltmeter should be connected across the components of and R 2 to give correct reading for potential difference.
Question 4. An ammeter has 20 divisions between 0 mark and 2A mark on its scale. The least count of ammeter is a 0. Question 5. A student finds that there are 20 divisions between zero mark and 1V mark of a voltmeter. The least count of voltmeter is a 0.
Question 6. The current flowing through a resistor connected in an electric circuit and the potential difference applied across its ends are shown in figure alongside. Answer One electron possesses a charge of 1. Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value.
What change will occur in the current through it? What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? R is the equivalent resistance of resistances 0. These are connected in series. Hence, the sum of the resistances will give the value of R.
Each component of a series circuit receives a small voltage so the amount of current decreases and the device becomes hot and does not work properly. Hence, series arrangement is not used in domestic circuits.
So they are usually used for electricity transmission. Previous Post Next Post.
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