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Quantities and Units - Engineering

Q1:

The number of kilowatts in 135 milliwatts is

A 1.35 × 10–4 kW

B 135 × 10–3 kW

C 0.0135 kW

D 0.00135 kW

ANS:A - 1.35 × 10–4 kW

1watt = 10^3millwatts.
1millwatts = 1\10^3watt,
= 10^-3watts.

1Kw = 10^3watts,
1watt = 1/10^3kilowatts,
= 10^-3kilowatts.

135milliwatts = 135 * 10^-3watt,
= 135*(10^-3)*(10^-3) kilowatts,
= (135/10^2)*10^(-3-1) kilowatts,
= 1.35*10^-4kilowatts.