BRAINCAKETemperature and Number Density
If the temperature of a metal wire is increased, the positive ions vibrate more. Electrons collide with the positive ions more often and lose energy as heat energy. The resistance of the wire increases with temperature.
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Key terms in this lesson
- density
- The mass per unit volume of a substance.
- energy
- The capacity of a system to do work.
- resistance
- The ratio of the potential difference across a component to the current through it.
- number density
- The number of charge carriers, such as free electrons, per unit volume of a material.
More in Electricity
- Temperature and Resistance
- IV Graphs
- Diodes
- Resistivity
- The Thermistor
- The Light Dependent Resistor
- Electrical Power
- Electricity in the Home
All 30 lessons in Electricity · All OCR AS-level Physics topics