Question

Why does the light of a car dim when the starter is operated?
A. The starter motor draws a large current resulting in a large potential drop in the battery, which reduces the thermal voltage of the battery.
B. When the starter motor is switched on, it increases the resistance of the filament of the bulb in the car light.
C. When the starter motor is switched on, it reduces the EMF of the battery.
D. The starter motor produces fumes, which absorb a part of the light of the car lamp.

Answer 1

Hint: A starter is a device used to rotate an internal-combustion engine to initiate the engine's operation under its own power. A starter can also be another engine.

Complete step by step answer:
We are given to find the reason why the light of a car becomes dim when the starter is operated.A starter is a device used to rotate an internal combustion engine to initiate the engine’s operation of the car. A starter can also be an engine which is used to start the primary engine.A starter solenoid is an electromagnet which is attached to the starter and used for controlling the starter.To make an engine start it must be turned at a certain speed, so that it sucks fuel and air into its engine cylinders, and compresses it. The powerful starter motor does the turning and sucks the fuel to start the car.
To start a car, the starter needs high electric currents. A solenoid is used to control the high currents.When a starter is operated on, the starter motor draws a large current resulting in a large potential drop in the battery, which reduces the thermal voltage of the battery.
Therefore, the car light will be dimmed.
The answer is Option A.

Note: The starter needs a heavy electric current, which it draws through thick wires from the battery. Starter needs a large switch to handle the high current. The switch has to be turned on and off quickly to avoid dangerous and damaging sparking in the engine. So a starter solenoid is used to control the starter.