BRAINCAKEMeasuring Internal Resistance
The p.d. across the terminals of a cell can be measured using a high resistance voltmeter when the cell is in a circuit and current is flowing.
The current is varied by adjusting a variable resistor and a fixed resistor is used to limit the maximum current that can pass through the cell
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Key terms in this lesson
- Electromotive force
- The electrical energy produced per unit charge by a source, such as a cell, in driving current around a circuit.
- Potential difference
- The energy transferred per unit charge as charge moves between two points in a circuit.
- Resistance
- The ratio of the potential difference across a component to the current flowing through it, measured in ohms.
More in Direct Current Circuits
- Resistors in Parallel
- Resistance Heating
- Internal Resistance
- Power
- Cells in Series
- Cells In Parallel
- Diodes in Circuits
- The Potential Divider - Fixed p.d.
All 15 lessons in Direct Current Circuits · All AQA AS-level Physics topics