Which device is commonly used to detect the presence of voltage in a circuit?

The device commonly used to detect the presence of voltage in a circuit is the voltage tester. Voltage testers are simple tools designed specifically to verify whether electrical voltage is present in a circuit or on a wire. They usually feature an indicator light or audible signal that activates when voltage is detected, making them user-friendly for quick checks.

While a multimeter can also measure voltage and is a versatile tool for various electrical measurements, it typically requires a bit more interaction and knowledge to use effectively, as it involves selecting the correct settings and leads. Amperage meters focus on measuring current flow and are not designed for voltage detection. An oscilloscope, while powerful for visualizing waveforms and analyzing voltage changes over time, is relatively complex and is not typically used as a simple tool for determining whether voltage is present in a circuit. Thus, the voltage tester is the most straightforward and focused device for detecting voltage.