O Level Physics: Electricity and Magnetism (5054)

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66 lessons

4.1 · Simple magnetism and magnetic fields

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4.2.1-4.2.4 · Electrical quantities

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Electric charge

Preview14m

Conductors and insulators

Preview12m

Electric fields

14m

Electric current

14m

Measuring current with an ammeter

14m

Direct current and alternating current

12m

Electromotive force (e.m.f.)

10m

Potential difference and voltmeters

10m

Resistance

10m

Measuring resistance

15m

Current-voltage graphs

10m

Resistance of a wire: length and cross-sectional area

10m

Electrical quantities: practice

Electrical quantities: exam practice

15m

Electrical quantities: summary

4.3.1-4.3.3 · Electric circuits

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4.4.1-4.4.2 · Practical electricity

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4.5.3-4.5.5 · Magnetic effect of a current, forces and the d.c. motor

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4.5.1-4.5.2, 4.5.6, 4.6 · Electromagnetic induction, the transformer and the oscilloscope

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4.2.1-4.2.4 · Electrical quantitiesLesson 9 of 15

Resistance

Resistance tells you how hard it is to push current through a component: R = V/I, measured in ohms.

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