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Magnetic Effects of Electric Current
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02/08/2021 12:51 pm
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A domestic lighting circuit has a fuse of 5 A. If the mains supply is at 230 V, calculate the maximum number of 36 W tube lights that can be safely used in this circuit.
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02/08/2021 12:52 pm
Let the maximum number of tube-lights be y.
Power of y tube-lights, P = 36y
V = 230V, I = 5A
We know that
P = VI
36y = 230 x 5
36y = 1500
y = 31.94
So, number of tube-lights required are 31.