Step 4 of 4 · topic
Electric circuits
WJEC 1420QS — matched to your course.
Charge flow, emf, internal resistance, resistivity and circuit laws.
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Determining the resistivity of a wire
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Subtopics and study areas
- Measure resistance, length and cross-sectional area and use ρ = RA/L.
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Electric circuits
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Subtopics and study areas
- Apply Kirchhoff's laws and circuit equations.
- Distinguish emf from terminal potential difference.
- Use resistivity and potential-divider relationships.
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EMF and internal resistance
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Subtopics and study areas
- Vary current and use terminal potential difference data to determine cell emf and internal resistance.
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I-V characteristics of a lamp and metal wire
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Subtopics and study areas
- Measure current-voltage characteristics for a filament lamp and a metal wire while controlling temperature where required.
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Resistance of a metal wire against temperature
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Subtopics and study areas
- Measure how the resistance of a metal conductor changes with temperature.
