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guestz

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If the voltage, V, in an electric circuit is held constant, the current, I, is inversely proportional to the resistance, R. If the current is 120 milliamperes when the resistance is 5 ohms, find the current when the resistance is 15 ohms.
 
If the voltage, V, in an electric circuit is held constant, the current, I, is inversely proportional to the resistance, R. If the current is 120 milliamperes when the resistance is 5 ohms, find the current when the resistance is 15 ohms.

V = iR

First, solve for V with the information given:

V = (120 mA)(5 ohms) = (.12 A)(5 ohms) = .6 Volts

So, to solve for current, your equation is

i = V/R = (.6 V)/(15 ohms) = .04 Amps = 40 mA
 
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