Two bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to an electric

Electricity (10)

Two bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to an electric mains of 220 V. Find the current drawn by the bulbs from the mains.  

Answer

Current drawn by first bulb

$$ I_1 = \frac{100 W}{220 V} =\frac{100}{220}  ampere $$

Current drawn by second bulb

$$ I_2 = \frac{60 W}{220 V} = \frac{60}{220}  ampere $$

Both the bulbs are in parallel

Total current, I = I₁ + I₂

$$ = \left(\frac{100}{220} + \frac{60}{220}\right) ampere = \frac{160}{220}A = 0.73 A $$

• Exam Year: 2022