In an emergency you need to power a radio that uses 25 W of power when attached

Question

In an emergency you need to power a radio that uses 25 W of power when attached to a 6.0-V power supply. The only power supply you have access to provides 120 V, but you do have a very large number of 4.0-ohm resistors. If you want the power in the radio to be as closes as possible to 25 W, how many resistors do you need to use?
120 10 144 5 7 In an emergency you need to power a radio that uses 25 W of power when attached to a 6.0-V power supply. The only power supply you have access to provides 120 V, but you do have a very large number of 4.0-ohm resistors. If you want the power in the radio to be as closes as possible to 25 W, how many resistors do you need to use? In an emergency you need to power a radio that uses 25 W of power when attached to a 6.0-V power supply. The only power supply you have access to provides 120 V, but you do have a very large number of 4.0-ohm resistors. If you want the power in the radio to be as closes as possible to 25 W, how many resistors do you need to use?
120 10 144 5 7 120 120 10 10 144 144 5 5 7 7

Explanation / Answer

I = V/P = 6/25 = 0.24

R = V^2/P = 36/25 = 1.44

(1.44+n*4)*0.24 = 120

n = 120

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