What device is used to measure volts, ohms, and milliamperes?

A VOM multimeter, or Volt-Ohm-Milliammeter, is a versatile instrument specifically designed to measure voltage (volts), resistance (ohms), and current (milliamperes). This multifunctionality makes it an essential tool for electricians and technicians, allowing them to diagnose, troubleshoot, and test electrical circuits effectively.

The device operates by allowing the user to select the type of measurement needed, whether it is voltage, resistance, or current. For voltage measurement, it connects in parallel across a circuit element. For resistance, it requires the component to be isolated from power; it measures the opposition to current flow. When measuring current, it is connected in series with the circuit.

The other devices mentioned have specific functionalities but do not measure all three parameters. An oscilloscope primarily displays voltage waveforms over time and is more suited for analyzing signal shapes than for measuring resistance or current. A wattmeter measures electrical power in watts and does not directly measure voltage, ohms, or milliamperes. Lastly, an analog ammeter exclusively measures current and does not provide readings for voltage or resistance, limiting its application compared to a multimeter.