Which statement best defines EMF?

Which statement best defines EMF?

• A. The force that causes electrons to flow
• B. The unit for electromotive force
• C. The potential difference across a conductor
• D. The current in a circuit

Answer: (A)

EMF is the energy provided per unit charge by a source to move charges around a circuit. This energy creates the driving push that makes electrons flow, so it functions as the force that drives current through the loop. EMF is measured in volts, and it isn’t a literal physical force, but the amount of energy the source delivers per coulomb of charge. The current that flows results from this driving energy working against the circuit’s resistance, with the actual voltage across conductors being the outcome of EMF minus drops due to resistance.

EMF is the energy provided per unit charge by a source to move charges around a circuit. This energy creates the driving push that makes electrons flow, so it functions as the force that drives current through the loop. EMF is measured in volts, and it isn’t a literal physical force, but the amount of energy the source delivers per coulomb of charge. The current that flows results from this driving energy working against the circuit’s resistance, with the actual voltage across conductors being the outcome of EMF minus drops due to resistance.