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3 December, 20:08

How much voltage is required to make 4 amperes flow through a resistance of 20 ohms?

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  1. 3 December, 20:29
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    V = I * R = (4 A) (20 Ω) = 60 V

    OR

    [From P = IV = V²/R, R = V²/P = (120 V) ² / (60 W) = 240 Ω; for the 40-W lamp, R = (120 V) ² / (40 W) = 360 Ω.

    Explanation:

    Maybe ... sorry I haven't really worked on this
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