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Question

Two resistors R1=60Ω and R2=90Ω are connected in parallel. If electric power consumed by the resistor R1 is 15W, calculate the power consumed by the resistor R2.

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Solution

Electric power consumed by R1 is P1=15 W
Potential difference across resistor R1 V=P1R
V=(15)(60)=30 volts
Since both resistors are connected in parallel, thus potential difference across resistor R2 is also V=30 volts
Thus power consumed by resistor R2 is P2=V2R2
P2=(30)290=10 W

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