Two electric bulbs, ''A'' and ''B'' of power 500W and 2000W, respectively, are connected to a 240V supply. The ratio of current passing through bulb 'A' to the current passing through bulb 'B' is:
Correct answer: B. 1:4
- A. 1:2
- B. 1:4
- C. 1:8
- D. 1:16
Explanation
Given data: Power of bulb A = P1 = 500W Power of bulb B = P2 = 2000W Voltage = V = 240V To find: The ratio of current passing through bulb 'A' to the current passing through bulb 'B' = ? Solution: Current is given by: ⇒ I=P/V Now to find the ratio, ⇒ I1 : I2 ⇒ P1/V : P2/V ⇒ 500/240 : 2000/240 ⇒ 2 : 8 ⇒ 1 : 4
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