In any energy conversion process the lost energy is transformed into ……..
a) light
b) heat
c) none
d) both a & b
……………the ratio of useful energy or work output to the total energy or work input.
a) probability
b) degree
c) efficiency
d) productivity
The unit of efficiency is ………………
a) J/S
b) W/S
c) Ca/s
d) none of these
Explanation: Efficiency is the ratio of same quantities and therefore units cancel, therefore efficiency has no units.
An incandescent light bulb is only…efficient.
a) 5%
b) 10%
c) 20%
d) 30%
A florescent lamp is about ………efficient.
a) 10%
b) 30%
c) 20%
d) 40%
Explanation: A Florescent lamp is about 20% efficient of converting electrical energy into light.
