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Writer's pictureEvan Toh

PP2017Q11 Using P=I^2R and P=V^2/R to explain which has higher power

Updated: Oct 23

Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will think of using P = IV. But when using P = IV, it cannot relate to resistance R of the resistors directly.


Hence it will be more appropriate for us to P = I^2R or P = V^2/R.


For resistors in series, the current is the same. Hence it will be more direct to compare P and R using P = I^2R, where P is directly proportional to R.


For resistors in parallel, the p.d. is the same. Hence it will be more direct to compare P and R using P = V^2/R, where P is inversely proportional to R.


Refer to the video for explanation



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