A DC control coil has 24 volts across its winding and draws 0.20 ampere after reaching steady state. What is its winding resistance?
- 120 ohms
- B24.2 ohms
- C0.0083 ohm
- D4.8 ohms
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why A is correct
At DC steady state, R = V/I = 24/0.20 = 120 ohms. The product V × I = 4.8 watts is power, not resistance. This calculation does not describe an AC coil or its switching transient.