Resistance
Core concepts and learning points for this section:
Syllabus Points
Core
- 4.2.4.1 Recall and use the equation for resistance V R = I
- 4.2.4.2 Describe an experiment to determine resistance using a voltmeter and an ammeter and do the appropriate calculations
- 4.2.4.3 State, qualitatively, the relationship of the resistance of a metallic wire to its length and to its cross-sectional area
Supplement
- 4.2.4.4 Sketch and explain the current–voltage graphs for a resistor of constant resistance, a filament lamp and a diode
- 4.2.4.5 Recall and use the following relationship for a metallic electrical conductor: (a) resistance is directly proportional to length (b) resistance is inversely proportional to cross-sectional area