Lesson 2

Unit 2 — Electricity and Magnetism

Lesson parts

2.1 1.1 Free electrons and electric current

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2.2 1.2 Electric current intensity

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2.3 1.3 Electric potential difference (voltage)

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2.4 1.4 Electric sources and electromotive force

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2.5 1.5 Connecting electric cells

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2.6 1.6 Electric resistance

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2.7 1.7 Circuit symbols and circuit diagrams

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2.8 1.8 Summary of Lesson 1

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2.9 2.1 How is the current in a conductor determined? Ohm's law

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2.10 2.2 Connecting identical resistors

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2.11 2.3 Electric power and energy

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2.12 2.4 Electrical safety

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2.13 2.5 Summary of Lesson 2

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2.14 3.1 The magnetic effect of electric current

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2.15 3.2 The electromagnet

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2.16 3.3 Magnetic force on a current-carrying wire

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2.17 3.4 The simple electric motor (DC motor)

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2.18 3.5 The electric generator

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2.19 3.6 Summary of Lesson 3

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