Ohm's law, resistivity and resistor codes

Sign in to read this lesson

Lessons are for learners and teachers with an account. Browsing the curriculum — subjects, strands and what each sub-strand covers — stays open to everyone.

• 15 sections of explanation, worked examples and diagrams
• 2 practice tasks with hints and worked answers
• A quiz that marks itself as you go
• Your progress kept across every subject you take

Other lessons in this sub-strand

1. Current, voltage and resistance
2. Ohm's law, resistivity and resistor codes
3. Resistor networks, power and heating
4. Circuit symbols and drawing circuits
5. Measuring current with an ammeter
6. Measuring potential difference
7. Verifying Ohm's law
8. Factors affecting the resistance of a wire
9. Measuring the resistivity of a wire
10. Determining e.m.f. and internal resistance
11. Laws of current and voltage in a circuit
12. Series circuits
13. Parallel circuits
14. Mixed networks and voltage dividers
15. Electrical energy and the kilowatt-hour
16. Heating effect of an electric current
17. Fuses, ratings and choosing cable
18. Kenya domestic wiring and electrical safety