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Circuit Theorems and Conversions - Engineering

Q1:

An 18 V source has an internal resistance of 70 . If a load resistance of 33  is connected to the voltage source, the load power, PL, is

A 0 W

B 1 W

C 175 mW

D 18 mW

ANS:B - 1 W

p = VL*I.

VL = 18*33/(33+70) = 5.76.

I = 18/(70+33) = 0.174.

p = 5.76*0.174 = 1.