Chapter 3: Electricity

Q&A -Ask Doubts and Get Answers

Q
Electricity

Question:

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Answer:

The lamps are connected in parallel, so the voltage across each lamp will be 220 V because the voltage is the same in a parallel circuit.

For 100 W lamp, the current drawn is given by,

P = VI

I = frac{P}{V}

Given: V = 220 V, P = 100 W

I_1 = frac{100}{220} A

Similarly, for 60 W lamp

V = 220 V, P = 60 W

I_2 = frac{60}{220} A

Total current,I = I_1 + I_2

I = frac{100}{220} + frac{60}{220}

I = frac{160}{220}

I = frac{8}{11}

I = 0.727 A


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