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NCERT Solutions for Class 10 Science Chapter 12 Electricity (Updated )
(e) Copper and aluminium wires are good conductors of electricity. So they have low resistivity. They Ncert Solutions Class 10th Physics Electricity Ltd offer low opposition to the flow of current from one point to the other, hence employed for electricity. We hope the NCERT Solutions for Class 10 Science Chapter 12 Electricity help you. If you have any query regarding NCERT Solutions for Class 10 Science Chapter 12 Electricity, drop a comment below and we will get back to you at the earliest. Filed Under: CBSE Class 10 Science. Reader Interactions. Comments. NCERT Solutions Chapter 12 Class 10 Science is an effective solution set prepared by famous teachers worldwide. They have prepared the PDF version of the NCERT Solution of Science Class 10 Electricity and have made it available for download. The students can download the solution set as per their convenience on their computer, tablets, or mobiles and study them in their preparation for their respective examinations. You can Find the Solutions of All the Science Chapters below. NCERT Solutions for Class 10 Science. This page contains CBSE Solved Questions in Electricity for Class 10 Science(physics), Numerical Questions for Electricity.� Question 1 A wire of length 3 m and area of cross-section ? m2 has a resistance 3 ? ohm. a. What is the formula for resistivity of the wire and what is the unit of it b. Calculate the resistivity of the wire Solution a. Resistivity of the wire is given by $\rho =R\. frac{A}{L}$ And It unit is Ohm-m b. In this case L=3 m $A= \times 10^{-6}$ m2 $R=3 \times 10^{-2}$ ohm So $\rho= \times 10^{-8}$ Ohm-m.

Practise numericals to learn how to calculate the current flowing through a circuit as per the given data. Go through our CBSE Class 10 Physics textbook solutions to learn the steps to find the energy consumed by an appliance. To improve your Physics practice, we also provide resources like online video lessons , practice tests and solved question papers. An electric circuit is a continuous conducting path that consists of electric devices, switching devices, source of electricity, etc.

Concept Insight:- The figure given below is an example of an electric circuit. One electron possesses a charge of 1. A source of electricity such as cell, battery, power supply, etc. If 1 J of work is done to move a charge of amount 1 C from one point to another, then it is said that the potential difference between the two points is 1 V.

Concept Insight:- The amount of work done to move to each coulomb of charge is equal to the energy given it. Concept Insight:- Resistance of a wire is given by the relation,. Thicker the wire, larger is its area of cross-section and hence lower is the resistance of the wire.

Therefore, current can flow more easily through a thick wire than a thin wire. Concept Insight:- The current flowing through the component is given by Ohm's law. Concept Insight:- Resistivity and melting point are two important factors here. The resistivity of an alloy is higher than the pure metal. Moreover, at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal.

Resistivity of mercury is more than that of iron. This implies that iron is a better conductor than mercury. Hence, it is the best conductor. The following circuit diagram shows three resistors of resistances 5 ohm, 8 ohm and 12 ohm respectively connected in series with a battery of potential 6 V and a plug key.

Concept Insight:- The voltages of cells in series add up to give the final voltage. To measure the current flowing through the resistors, an ammeter should be connected in the circuit in series with the resistors. To measure the potential difference across the 12 ohm resistor, a voltmeter should be connected in parallel to this resistor, as shown in the following figure. Concept Insight:- Ohm's law can be used to obtain the readings of ammeter and voltmeter.

Concept Insight:- For parallel combination, equivalent resistance R is given by. These are connected in parallel, as shown in the following figure. Therefore, the resistance of the electric iron is The advantages of connecting electrical devices in parallel with the battery instead of connecting them in series are:. In parallel circuit, if one electrical device stops working, then all other devices keep working normally. This is not the case when devices are connected in series.

There is no division of voltage among the appliances when connected in parallel. The potential difference across each appliance is equal to the supplied voltage. In series circuit, the applied voltage is shared by all the appliances.

The total effective resistance of the circuit can be reduced by connecting electrical appliances in parallel. In series combination, the total effective resistance of the circuit increases. Concept Insight:- All the resistors are connected in parallel. Therefore, their equivalent resistance will be given as. Therefore, 48 ohm is the highest total resistance that can be secured by the combination of given resistances.

If these coils are connected in parallel, then the equivalent resistance will be the lowest, given by. Therefore, 2 ohm is the lowest total resistance that can be secured by the combination of given resistances. Concept Insight:- The amount of heat produced in a conductor is proportional to its resistance. The resistance of the heating element of an electric heater is very high.

As current flows through the heating element, it becomes too hot and glows red. On the other hand, the resistance of the cord of the heater is much lower, so it does not become very hot and does not glow when current flows through it. Therefore, the amount of heat developed in the electric iron is. The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

Concept Insight:- Power of an appliance determines the rate at which electrical energy is delivered to it. Concept Insight:- Power of an appliance can be determined by the rate at which electrical energy is delivered to it.

Concept Insight:- For parallel combination, equivalent resistance R' is given by. From equation ii , it can be written Power P cannot be expressed as IR 2. The resistance of the bulb remains constant if the supply voltage is reduced to V.

If the bulb is operated on V, then the energy consumed by it is given by the Ncert Solutions Class 10th Physics Electricity Mac expression for power as. Both the wires have the same resistance because they are made of the same material and have equal lengths and diameters. Let the resistance be R. Let the current through the series combination be I s and heat produced in the circuit be H s.

Let the current through the parallel combination be I p and heat produced in the circuit be H p. To measure the potential difference between two points, a voltmeter should be connected in parallel across these points. Concept Insight:- Voltmeter is always connected in parallel to the element of any electrical circuit across which potential difference is to be measured.

Resistance R of the copper wire of length l and cross-section A is given by the expression,. Resistivity of copper,. Area of cross-section of the wire,. The VI graph is shown below. The voltage is plotted on x -axis and current is plotted on y -axis.

Concept Insight:- In a series combination, current flowing through all the components of the circuit is the same.

There is no current division occurring in a series circuit. Current flow through all the components is the same, given by Ohm's law as. Let, R be the equivalent resistance of resistances 0. These are connected in series. Hence, the sum of the resistances will give the value of R. Hence, tungsten is mainly used almost exclusively for filament of incandescent lamps. It produces large amount of heat. Thus series arrangement is not used for domestic circuits. They are good conductors of electricity.

Hence, they are usually employed for electricity transmission. Enter the OTP sent to your number Change. Resend OTP. Don't miss this! Ok Cancel. Ok Choose Chapter. Ok Choose Topic. Yes No. Choose Subjects. Choose Chapters. Chapter 12 - Electricity Exercise Solution 1.

The unit of electric current is ampere A. The resistance of a conductor depends upon the following factors: a Material of the conductor, i.

Let the new amount of current be I '. Therefore, from Ohm's law, we obtain the amount of new current. Therefore, the amount of current flowing through the electrical component is reduced by half. Concept Insight:- Less resistivity means better conductance. The resistances are connected in series. The reading of the voltmeter will be 2. The advantages of connecting electrical devices in parallel with the battery instead of connecting them in series are: 1.

There are four coils of resistances 4 ohm, 8 ohm, 12 ohm, and 24 ohm respectively. If these coils are connected in parallel, then the equivalent resistance will be the lowest, given by Therefore, 2 ohm is the lowest total resistance that can be secured by the combination of given resistances.

The given piece of wire has a resistance R. The wire is cut into five equal parts.

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