What is another name for voltage?

• A. Difference in Kinetic Energy between 2 points
• B. Electromotive Force
• C. Current
• D. Electromagnetic Field

Answer: (B)

Voltage is the electrical potential difference that pushes charges to move in a circuit. Electromotive force, or emf, refers to the energy per unit charge that a source like a battery provides to create that push. In practice, emf is the voltage a source can deliver, especially when there’s no internal resistance, and it sets up the potential difference that drives current. When current flows, the terminal voltage may be less than the emf because of the source’s internal resistance, but conceptually emf is the “voltage” the source supplies. The other ideas don’t describe this push: a difference in kinetic energy between two points is a mechanical concept, current is the flow of charges, and the electromagnetic field is the broader field around charges and currents, not the voltage itself.