Exercise-11.4 Page: 156
1. What is power?
Power is that the rate of doing work or the speed of transfer of energy. If W is that the quantity of work wiped out time t, then power is given by the expression,
P = W/T
It is expressed in watt (W).
2. Define 1 watt of power.
A body is claimed to possess power of one watt if it will work on the speed of 1 joule in 1 s.
One W = 1 J/1 S
3. A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
Power = Work/Time
P = W/T
Time = 10 s
Work done = Energy consumed by the lamp = 1000 J
Power = 1000/10 = 100 Js-1 =100 W
4. Define average power
The average Power of an agent could also be outlined because the total work done by it within the total time taken.
Er. Aman Blogger, Educator