with e.m.f. E=12 V and an internal resistance r=1 Ωis connected across a resistor R=20 Ω. Find

step 1 So we have deliverable voltage equals the EMF of the battery minus I times the internal resistan

With e.m.f. E=12 V and an internal resistance r=1 Ωis...

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Key Concepts

Ohm's Law

Ohm's Law relates voltage, current, and resistance in an electrical circuit (V = IR). It is fundamental for analyzing how current flows through circuits and how voltage is distributed, especially when internal resistances are involved.

Voltage Divider

This principle describes how an input voltage is divided among series resistors. The voltage drop across a resistor in a series circuit is directly proportional to its resistance, making the voltage divider an essential tool for predicting circuit behavior.

Electromotive Force (emf)

This is the energy per unit charge supplied by a source such as a battery. It represents the ideal voltage provided by the source when no current is drawn from it, distinct from the terminal voltage when internal resistances are present.

Internal Resistance

Every practical power source has an inherent resistance that causes a voltage drop when current flows. This internal resistance affects the overall performance of the circuit by reducing the terminal voltage available to the external circuit.

Series Circuits

In a series circuit, components are connected one after the other so that the same current flows through each component. The total resistance is the sum of individual resistances, which is crucial when analyzing voltage drops across each element of the circuit.

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