Q19 of 36 Page 120

What is electrical power? Write the essential formula for it.

Electric Power(P) is the rate of doing work or it is the ratio of work done(W) divided by the time is taken (t) or it is the rate of consumption of energy. The units of power are Watt or KiloWatt or Joules/second.

Hence the main relation of power is,



1 watt = 1 J/s and 1 watt is the power of appliance which consumes energy at the rate of 1 J/s or 1 watt is defined as when 1 Joule of work is done on a particle in 1 second.


Another relation of power is, P = VI = I2R .


More from this chapter

All 36 →
17

How the electric combination of various application done in homes?

 18

What is the difference between series combination and the parallel combination of resistors?

 20

Two resistors are made up of same material and same length. If their area of cross section ratio is 2: 11 then calculate the ratio of their resistances.

 21

Define electric potential and potential difference.