UPS Industrial Maintenance Mechanic Practice Test

Voltage is the electrical pressure that pushes charges through a circuit, creating current. It’s the potential difference between two points that drives electrons to move through conductors and loads. Think of it as the push behind the flow: the higher the voltage (with resistance constant), the more current will flow, which is why a battery or power supply provides the driving force for the circuit. This relationship is captured by Ohm’s law, I = V/R, where current is the flow rate, voltage is the driving force, and resistance is what resists that flow. The other statements describe different concepts: flow of electricity measured in amps refers to current, not voltage; alternating current changing direction describes AC behavior, not what voltage is; and opposition to current flow describes resistance. In short, voltage is the electrical pressure that pushes current through the circuit.