Which of the following components should be checked if the ceiling light fixture is not working?

The most relevant components to check if the ceiling light fixture is not working include the breaker and the light bulb. When a light fixture fails to illuminate, the first logical steps are to ensure that the electrical circuit supplying power to the fixture is functioning correctly.

Checking the breaker helps determine if it has tripped or blown, which would prevent electricity from reaching the light fixture. If the breaker is fine, then the light bulb needs to be checked to see if it is burnt out or improperly seated in the socket. A burned-out bulb is a common and simple issue that can easily be resolved by replacing it. Ensuring both the breaker and the light bulb are in good condition is essential for troubleshooting the problem efficiently.

While other options involve components related to electricity, they either do not specifically pertain to the immediate issue of the ceiling light fixture or cover too broad an area, making them less efficient as first checks.