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Charge flow and electrical power Charge and current4.1 Energy, power and resistance4.2 Resistivity4.2.4
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Course idea

Resistivity

OCR A AS Physics · 4.2.4

Explore resistivity within energy, power and resistance. Potential difference measures energy transferred per unit charge. Combine it with current to calculate power, and investigate how components respond to changing voltage.

Specification outcomes (4)
  • 4.2.4(a)(i) Define resistivity using R = ρL / A.
  • 4.2.4(a)(ii) Use techniques and procedures to determine the resistivity of a metal.
  • 4.2.4(b) Describe variation of resistivity of metals and semiconductors with temperature.
  • 4.2.4(c) Understand the negative temperature coefficient (NTC) thermistor and variation of resistance with temperature.
Open the official OCR AS specification ↗

H156 v2.0 · May 2026

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