Question

Two bulbs $PandQ$ are rated 100W, 220V and 50W, 220V respectively. They are connected in parallel across 220 V source. The current in the bulbs P and Q is respectively?

• A. $\frac{5}{22}A,\frac{5}{11}A$
• B. $\frac{5}{11}A,\frac{5}{22}A$
• C. $\frac{10}{11}A,\frac{5}{22}A$
• D. $\frac{5}{22}A,\frac{10}{22}A$

Answer 1

The correct option is B $\frac{5}{11}A,\frac{5}{22}A$

Power rating of P = (100 W, 220V)
Power rating of Q = (50W, 220V)
In parallel connection voltage is same.

Power P = V$\times$I
$I=\frac{P}{V}$


For Bulb P, current is:
$I_p=\frac{100W}{220V}$
$I_P=\frac{5}{11}A$

$\therefore$ For Bulb Q, current is
$I_Q=\frac{50W}{220V}$
$I_Q=\frac{5}{22}A$