Physics Current Electricity ETEA 2022
PMDC Verified Question 61 of 112
Two electric bulbs "A" and "B" of powers 500W and 2000W respectively are connected to 240V supply. The ratio of current passing through bulb "A" to the current passing through bulb "B" is:
A
1:2
B
1:4
C
1:8
D
1:16
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 1:4
Concept:

When components are connected across the same voltage supply (parallel by default for rated household appliances unless stated otherwise), current is directly proportional to power.

Formula:

$$ P = VI \implies I = \frac{P}{V} $$

Solution:

  • Because both are connected to the same 240V supply, \( V \) is constant.


  • Current \( I \propto P \).


  • Ratio \( \frac{I_A}{I_B} = \frac{P_A}{P_B} = \frac{500}{2000} = \frac{1}{4} \).


  • The ratio is 1:4.


Why other options are incorrect:

  • Opt D: Would be the ratio if the relationship depended on the square of the power.

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