A 240-volt feeder carries 48 amperes, and the supplied total circuit resistance is 0.30 ohm. What voltage drop results?

Texas Journeyman exam practice question · Feeder Calculations

A 240-volt feeder carries 48 amperes, and the supplied total circuit resistance is 0.30 ohm. What voltage drop results?

A4.8 volts
B72 volts
C800 volts
14.4 volts

Why D is correct

Use the supplied circuit resistance with Ohm's law: 48 amperes times 0.30 ohm equals 14.4 volts. Relative to 240 volts, that is a 6-percent drop before considering any downstream branch circuit.

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A 240-volt feeder carries 48 amperes, and the supplied total circuit resistance is 0.30 ohm. What voltage drop results?

A 240-volt feeder carries 48 amperes, and the supplied total circuit resistance is 0.30 ohm. What voltage drop results?

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