G2 Gas Fitter Practice Exam

What is another term for electromotive force?

1. Current

2. Power

3. Voltage

4. Resistance

The correct answer is: Voltage

Electromotive force (EMF) is defined as the energy provided per charge by a source such as a battery or generator. It is a measure of the electrical potential difference that drives the flow of current in a circuit. Voltage is actually synonymous with electromotive force; it represents the force that pushes electric charge through a conductor. When we refer to voltage, we are indicating the potential for electric current to flow, which is fundamentally what electromotive force describes. In context, while current represents the flow of electric charge, power refers to the rate at which energy is transferred or converted, and resistance is a measure of how much a material opposes the flow of current. These terms each refer to different aspects of electrical systems, whereas voltage directly corresponds to the concept of electromotive force. Thus, the choice of voltage as the correct term accurately reflects its relationship with electromotive force in the understanding of electrical principles.