Question

domestic lighting circuit has a fuse of 5 ampere if the mains supply is at 230 volts calculate the maximum number of 36 watt tube lights that can be safely used in this circuit

Answer 1

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

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