Electric Power Questions

The rate at which work is completed or energy is converted into an electrical circuit is referred to as electric power.

It is given by the formula: P = VI.

The SI unit of electric power is the Watt.

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Watch the video and solve NCERT exemplar Questions in the chapter Electricity Class 10 Science

Important Electric Power Questions with Answers

1. Define power.

Power is defined as the rate at which the work is done.

2. List five applications of electric power.

Electric power is used in heating, cooking, entertainment, lighting, and healthcare.

1. The unit of electrical power is ______.
2. Radians
3. Kilogram
4. Joule
5. Watt

Answer: d) Watt

Explanation: The unit of electrical power is the Watt.

4. Define one Watt.

One Watt is the power of an appliance which consumes energy at the rate of one joule per second.

5. A body is said to have the power of 1 Watt if it does work at the rate of ______.

1. 1 joule
2. 1 joule in 1 second
3. 1 second
4. 1 radian / second

Answer: b) 1 joule in 1 second

Explanation: 1 Watt = Work at the rate of 1 joule per second.

6. The unit of power, the Watt, is named after which scientist?

The unit Watt is named after the scientist James Watt, the Scottish inventor and mechanical engineer.

7. Name other units of power.

Other units of power are horsepower, metric horsepower, foot-pounds per minute, and ergs per second.

8. Power is given by the formula ______.

1. P = W+t
2. P = W-t
3. P = 2W*t
4. P = W/t

Answer: d) P = W/t

Explanation: Power is given by the formula, P = W/t.

9. Choose the correct answer: Electric power is a _______.

1. Vector quantity
2. Scalar quantity
3. Dimensionless quantity
4. None of the options

Answer: b) Scalar quantity

Explanation: Electric power is a scalar quantity since it has only magnitude but no direction.

10. Power energy formula is given by ______.

1. P = Et
2. P = E/t
3. P = E+t
4. P = E-t

Answer: b) P = E/t

Explanation: The power energy formula is given by P = E/t.

Where,

E is the energy consumption (in Joules)

t is the time in seconds

See the video below to understand electric power and energy.

Practice Questions

1. Define electrical power.
2. What is the formula to calculate the power?
3. Mention the SI unit of power.
4. What is the source of electric power?
5. Define horsepower.