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Question
Two resistors R1= 60 Ω and R2 = 90Ω are connected in parallel. If electric power consumed by the resistor R1 is15 W, calculate the power consumed by the resistor R2.
Solution
Power of R1=`(V^2)/(R_1)`
⇒ `15 = (V^2)/60`
⇒ `V^2 = 60 xx 15 = 900`
∴ V = 30 V
Hence, R2 being parallel with R1, has same p.d.
∴ Power of `R_2 =(30xx30)/90 `= 10W.
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