ASA Electrical System Practice Test

When adding a rheostat to a light circuit, connecting it in series with the light is the correct approach. This arrangement allows the rheostat to control the amount of current flowing to the light.

When a rheostat is connected in series, it acts as a variable resistor that can adjust the resistance within the circuit. As the resistance increases, the current flowing through the circuit decreases, which in turn reduces the brightness of the light. Conversely, reducing the resistance will increase the current and make the light brighter.

This method of control is beneficial for dimming the lights, providing a way to adjust the light output based on the desired ambiance or functional need. Connecting a rheostat in parallel, on the other hand, would not effectively control the current through the light because the current would take the path of least resistance, bypassing the light entirely. Thus, using a series connection is essential for the intended adjustment of light intensity.