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In an electrical circuit, the voltage across a resistor is directly proportional to the current running through the resistor. If a current of 18 amps produces 720 volts across a resistor, how many volts would a current of 2. 5 amps produce across an identical resistor?.

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The voltage across the resistor is  100 V.

From Ohm's law, we know that the voltage is directly proportional to the current. Mathematically, we can write; V α I

Where;

V = voltage

I = current

When V = 720 volts and I =  18 amps

V = k I

k = V/I

k =  720 volts/18 amps

k = 40 ohm

Now;

To find V when I = 2.5 A

V = 40 ohm × 2.5 A

V = 100 V

Learn more about Ohm's law: https://brainly.com/question/796939

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