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Find the value of R if the power in the circuit is 1000W.

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in Basic Electrical Engineering by (88.7k points)
Find the value of R if the power in the circuit is 1000W.

(a) 10 ohm

(b) 9 ohm

(c) 8 ohm

(d) 7 ohm

I got this question in my homework.

This intriguing question originated from Kirchhoff’s Laws and Network Solutions in section Network Theorems of Basic Electrical Engineering

1 Answer

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Right answer is (c) 8 ohm

Easy explanation: To find the value of I:

VI=P =>100I=1000 => I=10A.

Voltage across the 2 ohm resistor = 20V.

Voltage across the R resistor = 100-20= 80V.

R=V/I => R=80/10 = 8A.

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