Question

a switch starts or stops the flow of electric current in a circuit by means of its
a probes.
b contacts.
c resistors.
d insulators.
click the button or type the letter next to your answer.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Probes are used for testing or measuring, not for controlling current flow in a switch.
• Option B: A switch uses its contacts (which can be opened or closed) to start or stop the flow of electric current in a circuit. When the contacts are closed, current flows; when open, it stops.
• Option C: Resistors are components that resist the flow of current (to control its magnitude), not to start/stop it like a switch.
• Option D: Insulators are used to prevent current flow (e.g., in the casing of a switch), not to control the flow via the switch's operation.

Answer:

B. contacts.