If a control circuit coil has a resistance of 50 ohms and is supplied by 120 V, what is the coil current?

• A. 0.96 A
• B. 1.5 A
• C. 2.4 A
• D. 6.0 A

Answer: (C)

Ohm's law tells us that current in a simple resistive circuit equals the voltage divided by the resistance. So with 120 V across a coil that has 50 Ω resistance, the current is 120 / 50 = 2.4 A.

This result matches the given conditions—if you used the other currents, you’d need different voltages across the same resistance (for example, 0.96 A would require 48 V, 1.5 A would require 75 V, and 6.0 A would require 300 V). The calculation here assumes the coil behaves as a purely resistive load under the given voltage.