Power is defined as the rate of doing work or the rate of transfer of energy. If an agent does a work W in time t, then power is given by: P = W/T It is expressed in watt (W). Define 1 watt of power. Solution: A body is claimed to possess power of one watt if it works at the speed of 1 joule in 1 s. That is, One W = 1 J/1 S

ScienceCLASS 9CBSE

answered 27 Mar 2026

What is power?

A.VERIFIED ANSWERfact-checked by tutors

Power is defined as the rate of doing work or the rate of transfer of energy. If an agent does a work W in time t, then power is given by:

P = W/T

It is expressed in watt (W).

Define 1 watt of power.

Solution:

A body is claimed to possess power of one watt if it works at the speed of 1 joule in 1 s.

That is,

One W = 1 J/1 S

Suggested Q&A

SCIENCE · CLASS 9

ScienceCLASS 9
1. Why does the temperature of a substance remain constant during its melting point or boiling point?
ScienceCLASS 9
Comment on the following statements: (a) Evaporation produces cooling. (b) Rate of evaporation of an aqueous solution decreases with increase in humidity. Sponge though compressible is a solid.
ScienceCLASS 9
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
ScienceCLASS 9
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?
ScienceCLASS 9
Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment
ScienceCLASS 9
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.