Power in Circuits Video Lessons

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Problem: Given: The circuit below, R2 = 20 kOhms, VS = 12V, and R1 starts at 100 kOhms and is turned down to 20 kOhms. Find: a) the power absorbed in R2 when R1 = 100 kOhms, and b) the power absorbed in R2 when R1 = 20 kOhms.

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We are dealing with power in circuits. 

Power in circuits:

P=Vi=i2R=V2R

We also have resistors in series.

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Problem Details

Given: The circuit below, R2 = 20 kOhms, VS = 12V, and R1 starts at 100 kOhms and is turned down to 20 kOhms. Find: a) the power absorbed in R2 when R1 = 100 kOhms, and b) the power absorbed in R2 when R1 = 20 kOhms.

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