Why is an ohmmeter useful for testing switches?

An ohmmeter is particularly useful for testing switches because it quickly indicates the condition of a switch. When a switch is in its closed position, it should allow current to pass through and show a low resistance reading on the ohmmeter. Conversely, if the switch is open, it will show a very high resistance or infinite resistance, indicating that no current can flow. This ability to assess whether a switch is functioning properly—open or closed—makes the ohmmeter an essential tool for technicians when troubleshooting electrical circuits.

By using an ohmmeter, technicians can efficiently determine if a switch operates as intended without needing to power the circuit. This quick diagnostic ability saves time and helps identify faulty components in electrical systems.