A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

What is Power?

Define 1 watt of power.

Define average power.

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’:

(a) Suma is swimming in a pong.

(b) A donkey is carrying load on its back.

(c) A wind-mill is lifting water from a well.

(d) A green plant is carrying out photosynthesis.

(e) An engine is pulling a train.

(f) Food-grains are getting dried in the sun.

(g) A sailboat is moving due to wind energy.