Question

9. As the efficiency of a device DECREASES, which
e DECREASES, which of the following will INCREASE?
a) power output
b) amplifier gain
c) heat output
d) output impedance​

Answer 1

If energy output and input are expressed in the same units, efficiency is a dimensionless number. Where it is not customary or convenient to represent input and output energy in the same units, efficiency-like quantities have units associated with them. For example, the heat rate of a fossil-fuel power plant may be expressed in BTU per kilowatt-hour. Luminous efficacy of a light source expresses the amount of visible light for a certain amount of power transfer and has the units of lumens per watt.