The voltage applied to a circuit is 12.0 V when the current...

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Key Concepts

Electromotive Force (emf)

Emf is the ideal voltage produced by a power source when no current is flowing, representing the total work done per unit charge. It is the source's ability to deliver energy to move charges through a circuit, unaffected by internal energy losses.

Internal Resistance

Internal resistance is the inherent resistance within a power source like a battery. It causes a voltage drop when current flows, reducing the voltage available to the external circuit and influencing the performance of the battery under load.

Terminal Voltage

Terminal voltage is the actual voltage measured across the battery's external terminals when the current is flowing. It is the emf minus the voltage drop across the internal resistance, and it determines the actual potential difference that the load experiences.

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuits, stating that the voltage across a resistor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance. This law is crucial for analyzing voltage drops, including those occurring across internal resistance in a circuit.

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