What is electromotive force and how does it relate to electrical circuits and measurements?
Understand the Problem
The question is asking about the concept of electromotive force (e.m.f.) as it relates to electrical circuits and how it functions in a battery or similar source. It discusses the difference between e.m.f. and potential difference, how they are measured, and the impact of internal resistance on voltage readings.
Answer
EMF is the energy per unit charge driving current in a circuit, measured in volts. It's higher than terminal voltage due to internal resistance.
Electromotive force (emf) is the energy per unit charge supplied by a source, which drives current in a circuit. It's measured in volts. When measuring, the terminal voltage usually drops due to the internal resistance of the circuit when current flows.
Answer for screen readers
Electromotive force (emf) is the energy per unit charge supplied by a source, which drives current in a circuit. It's measured in volts. When measuring, the terminal voltage usually drops due to the internal resistance of the circuit when current flows.
More Information
EMF is crucial for understanding how electrical devices operate, as it indicates the potential energy available to drive charge around a circuit.
Tips
A common mistake is confusing emf with terminal voltage; terminal voltage is usually less due to internal resistance when current flows.
Sources
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