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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 Class 10th Ncert Physics Syllabus Zip 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. Question 7. Question 8. In an experiment on studying the dependence of the current I flowing through a given resistor on the potential difference V applied across it, a student has to change the value of the current. For doing this, he should change the a number of cells used b resistor itself c ammeter used in the circuit d Voltmeter used in the circuit Answer: a If we change the number of cells in electric circuit, the potential difference will change and as a result current flowing in the circuit changes.
Question 9. A milliammeter had graduations marked 0, , , , and The space between 0 mark and mark is divided into 20 divisions. Question To determine the eguivalent resistance of two resistors connected in series, a student prepared two electric circuits, correct reading of ammeter in the circuits is [CCE ] a In circuit I, 1.
When parallel resistors are of three different values, the potential difference across its terminals is [CCE ] a greatest across smallest resistance b greatest across largest resistance c equal across each resistance d least across the smallest resistance Answer: c Potential difference across each resistor is same in parallel combination of resistors. Charge Something associated with the matter due to which it produces and experiences electric and magnetic effects.
Resides on the outer surface of the conductor. Types of Current Direct Current Current whose magnitude and direction does not vary with time. Alternating Current Current whose magnitude and direction periodically changes with time. Resistance R : Obstruction offered to flow of electrons. After stretching, if length increases by n times then resistance will increase by n 2 times i. Electric Circuit The arrangement of various electrical components along which electric current flow.
Heating Effect of Electric Current As current flows through a conductor, the free electrons lose energy Class 10th Ncert Physics Book Review which is converted into heat. Elements of Circuit Cell Direct current source of electromotive force. Combination of two or more cells is called battery. Rheostat Wire of special type of alloy like manganin, Eureka, nichrome, etc.
It controls the current in the electric circuit. Switch It is used to close or open the electric circuit, controls the movement of electrons in a circuit. Voltmeter Measures the potential difference between two points in the circuit. Its resistance is high and it is used in parallel with the resistance wire. Fuse It is a safety device having very thin wire which is made up of either tin or alloy of tin and lead.
This wire has low melting point so it melts and breaks the circuit easily if the current in the circuit exceeds. Ammeter Measures the value of current flowing in the circuit. The resistance of ammeter is small and it is used in series with the circuit.
LED It is a device which glows even if a weak electric current is allowed to flow through it. If you have any doubt regarding this article or NCERT Solutions For Class 10 Science Chapter 12 Electricity, leave your comments in the comment section below and we will get back to you as soon as possible.
Page Number: Question 1 On what factors does the resistance of a conductor depend? Answer: Advantages of connecting electrical devices in parallel with the battery are : In parallel circuits, if an electrical appliance stops working due to some defect, then all other appliances keep working normally.
In parallel circuits, each electrical appliance has its own switch due to which it can be turned on turned off independently, without affecting other appliances.
In parallel circuits, each electrical appliance gets the same voltage V as that of the power supply line. In the parallel connection of electrical appliances, the overall resistance of the household circuit is reduced due to which the current from the power supply is high. Page Number: Question 1 Why does the cord of an electric heater not glow while the heating element does?
When it is operated on V, the power consumed will be : a W b 75 W c 50 W d 25 W Answer: d 25 W Question 4 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 : a 1 : 2 b 2 : 1 c 1 : 4 d 4 : 1 Answer: c 1 : 4 Question 5 How is a voltmeter connected in the circuit to measure the potential difference between two points?
Students can easily download these materials and can use it offline also. These materials are NCERT solutions for all the chapters, revision notes, syllabus, sample papers, previous year question papers and important questions of class 10th. Our subject experts and experienced teachers has designed these materials, as per the latest CBSE syllabus With the help of these materials, students can find it easy to prepare for their exams and score good marks.
Students are provided here with an opportunity to use these materials for free while doing the preparation for the 10th board exam. As we already know, grade 10th is important for all the academic students. The marks obtained in this board exam have an impact on students forthcoming education life. Therefore, it is necessary for them to secure excellent marks in the final exams. Based on these marks they could decide to select their subject of interest in 11th standard.
Also, many students decides to get a job after 10th and many attempts to get colleges for diploma or inter studies. Therefore, LearnCBSE is trying to make the students prepared for all phase of the exams and get passed with flying numbers in 10th standard. Student can solve complex problems with the help of solutions, where the best and easy methods are given to explain the concepts.
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