Question

An electric bulb is rated as 50 watts 220 volts calculate the energy consumed by the bulb in 20 min express your answer in commercial units of electric energy

Answer 1

Energy=P×t=50×20×60=60000Watt-sec

(60000)÷(3600×1000)=0.01667 kilowatt-h=0.01667 B.O.T

Answer 2

P = VI = 50 W

$t = (20 \div 60)h \\ \: \: \: = (1 \div 3)h$

Energy consumed = VIt

= 50 × 1 ÷ 3

= 16.67 joules.

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