A design permits 7.56 volts of drop while carrying 42 amperes. What maximum total circuit resistance satisfies that limit?

Texas Journeyman exam practice question · Feeder Calculations

A design permits 7.56 volts of drop while carrying 42 amperes. What maximum total circuit resistance satisfies that limit?

0.18 ohm
B0.12 ohm
C0.32 ohm
D5.56 ohms

Why A is correct

Rearrange Ohm's law: resistance equals voltage drop divided by current. 7.56 ÷ 42 = 0.18 ohm. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.

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A design permits 7.56 volts of drop while carrying 42 amperes. What maximum total circuit resistance satisfies that limit?

A design permits 7.56 volts of drop while carrying 42 amperes. What maximum total circuit resistance satisfies that limit?

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