Power
Power
“ The rate of doing work by an agency is caled power”.
OR
“ Work done per unit time is called power”.
Average Power:
“The ratio of work ∆W and the time ∆t is known as Average Power”.
Mathematically:
Unit:
The unit of power is watt.
Watt
“If any agency performs 1 joule of work in 1 sec, then the power will will be 1 watt”.
Mathematically:
1Watt = 1 joule/ 1 sec
Dimensions:
[P] = [ W/t] = [M¹ L²T¯³]
Power and Velocity:
Suppose a constant force ‘F’ acts on a body which is moving with constant velocity ‘V’. Then the instantaneous power is given by
Other units of work:
1) Watt-sec
2) Kilo-watt hour
Watt- Sec:
“If 1 watt power is consumed for 1 sec, then the work is said to be 1 watt-sec”.
Kilo-watt hour:
“If an energy consumes 1 kilo-watt power for 1 hour, then the work or energy is said to be 1 kilo-watt hour”. Relation between kilo-watt hour and joule is
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