What unit measures the force or pressure of an electric current?

The unit that measures the force or pressure of an electric current is the volt. In the context of electricity, voltage represents the potential difference between two points in a circuit and can be thought of as the force that pushes electric charges through a conductor. This concept is crucial in understanding how electrical systems function, as higher voltage means a greater ability to drive current through a circuit.

Understanding voltage helps in assessing electrical safety, determining the performance of electrical devices, and ensuring that equipment operates correctly without risk of overload. The other options refer to different electrical characteristics: ohm measures resistance, ampere measures current, and hertz measures frequency. Each of these plays a unique role in electrical systems, but when it comes to the force that drives the current through a circuit, voltage is the correct unit of measurement.