A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the hot resistance of the lamp filament?

Correct Answer: Option A — 122.22 ohms

Rearranging Ohm's law to solve for resistance ($R = \frac{V}{I}$), dividing 110 volts by 0.9 amperes calculates a hot filament resistance of 122.22 ohms. This metric ensures proper load characterization under IEEE 45 electrical safety rules for marine lighting circuits.