There are 3.3V passing through an orange power supply cable, and there are 0.025 ohms of resistance in the orange wire. How much power is supplied to the orange wire by the power supply?

Question

Physics

Calvin

30 April, 19:22

There are 3.3V passing through an orange power supply cable, and there are 0.025 ohms of resistance in the orange wire. How much power is supplied to the orange wire by the power supply?

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Answers (1)

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Amy Thomas · Answer 1

P = V^2 / R.

So, 3.3^2 / 0.025 = 435.6W.

Note, you can get the power equation from:

P = V*I. Also, I = V/R.

Substituting V/R in for I in the 1st equation, you get P = V^2 / R.