A 120 V 60 W lamp is to be operated on 220 V a ... - JAMB Physics 2006 Question
A 120 V, 60 W lamp is to be operated on 220 V a.c. the supply mains. calculate the values of non-inductive resistance that would be required to ensure that the lamp is run on current value.
A
100 Ω
B
200 Ω
C
300 Ω
D
500 Ω
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Correct Option: B
Power of the lamp = 60W = (V2)/R and the voltage rate = 120v.
R = (V2)/60 = (120 X 120)/60 = 240 Ω, the fuse wire that should ensure current does not exceed this value should be rated 200 Ω
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