FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

How should a rheostat be connected to a light circuit to control light intensity?

In parallel with the light

Directly to the power source

In series with the light

A rheostat should be connected in series with the light in a circuit to control the light intensity. By placing the rheostat in series, the current flowing through the circuit must pass through the rheostat, allowing it to regulate the flow of electricity and thus control the light's intensity.

Connecting the rheostat in parallel with the light (Choice A) would not allow for proper control of the light intensity as the current could bypass the rheostat.

Directly connecting the rheostat to the power source (Choice B) would not effectively regulate the current flowing through the light, impacting the ability to control the light intensity.

Connecting the rheostat through a transformer (Choice D) is unnecessary for adjusting the light intensity and would add complexity to the circuit without providing any additional benefit in controlling the light.

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Through a transformer

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