Controls & Disconnecting Means — Texas Journeyman Practice Questions

2 questions · 4% of the Calculations exam

Worked questions

1. A 24-volt control coil draws 0.20 ampere in steady state. What is its effective resistance?

120 ohms
B24.2 ohms
C0.0083 ohm
D4.8 ohms

Why A is correct

Using Ohm’s law, resistance equals voltage divided by current. Twenty-four volts divided by 0.20 ampere equals 120 ohms; multiplying voltage and current would calculate watts instead.

2. A 48-volt control coil has 120 ohms effective resistance. What steady-state current does it draw?

0.40 ampere
B5.76 amperes
C2.50 amperes
D0.20 ampere

Why A is correct

Current equals voltage divided by resistance: 48 ÷ 120 = 0.40 ampere. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.

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Controls & Disconnecting Means — Texas Journeyman Practice Questions

Worked questions

1. A 24-volt control coil draws 0.20 ampere in steady state. What is its effective resistance?

2. A 48-volt control coil has 120 ohms effective resistance. What steady-state current does it draw?

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