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Resistance
Explore resistance 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 (5)
- 4.2.3(a) Define resistance using R = V / I and state the unit ohm.
- 4.2.3(b) State and apply Ohm’s law.
- 4.2.3(c)(i) Describe and sketch I–V characteristics for resistor, filament lamp, thermistor, diode and LED.
- 4.2.3(c)(ii) Use techniques and procedures to investigate electrical characteristics of ohmic and non-ohmic components.
- 4.2.3(d) Describe how the resistance of a light-dependent resistor (LDR) varies with light intensity.
H156 v2.0 · May 2026
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