Numericals for Class 10 Electricity Chapter 12

Electricity is a fundamental concept in physics, and the numericals in class 10 chapter 12 on electricity are essential to understand the concepts. Here are some numericals and their solutions to help you understand the chapter better.

Calculating the Resistance of a Wire

To calculate the resistance of a wire, you need to use the formula R = V/I, where R is the resistance, V is the voltage, and I is the current. Here is an example:

Suppose a wire has a voltage of 12V and a current of 2A. What is the resistance of the wire?

Solution:

R = V/I = 12/2 = 6Ω

Calculating the Power of a Bulb

To calculate the power of a bulb, you need to use the formula P = V * I, where P is the power, V is the voltage, and I is the current. Here is an example:

Suppose a bulb has a voltage of 120V and a current of 0.5A. What is the power of the bulb?

Solution:

P = V * I = 120 * 0.5 = 60W

Calculating Electrical Energy

To calculate electrical energy, you need to use the formula E = P * t, where E is the electrical energy, P is the power, and t is the time. Here is an example:

Suppose a bulb has a power of 100W and is kept on for 5 hours. What is the electrical energy consumed by the bulb?

Solution:

E = P * t = 100 * 5 = 500Wh or 0.5kWh

Calculating the Cost of Electrical Energy

To calculate the cost of electrical energy, you need to use the formula Cost = Units * Rate, where Cost is the cost of electrical energy, Units is the electrical energy consumed, and Rate is the cost per unit. Here is an example:

Suppose the cost per unit of electrical energy is Rs. 5, and a bulb consumes 0.5kWh of electrical energy. What is the cost of electrical energy consumed by the bulb?

Solution:

Units = 0.5kWh = 500Wh

Cost = Units * Rate = 500 * 5 = Rs. 250

Conclusion

Numericals in class 10 chapter 12 on electricity are essential to understand the concepts. By solving these numericals, you can improve your knowledge and skills in physics.