Electromotive force and potential difference

Core

• 4.2.3.1 Define electromotive force (e.m.f.) as the electrical work done by a source in moving a unit charge around a complete circuit
• 4.2.3.2 Know that e.m.f. is measured in volts (V)
• 4.2.3.3 Define potential difference (p.d.) as the work done by a unit charge passing through a component
• 4.2.3.4 Know that the p.d. between two points is measured in volts (V)
• 4.2.3.5 Describe the use of voltmeters (analogue and digital) with different ranges