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This question belongs to Electrical Engineering Circuit Theorems And Conversions

Circuit Theorems and Conversions

?

A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is

A) 2.38 mW B) 2.38 W C) 238 mW D) 23.8 W

Answer & Solution

Correct Answer: Option C

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Question posted by Examveda

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Afifa A 3 years ago

By Voltage divider rule
VL = (Vs * Rs)/ sum of resistances
= (12*20)/ (20+90) = 2.18V
To find power
P = V^2/R
PL = (VL^2)/RL
PL = (2.18^2)/20 = 237.62 mW => 238 mW

Engr Farman 6 years ago

P=sq I . R

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A 12 V source has an internal resistance of 90 If...

A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is

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