250 prompts matching "Simple machines on Nigerian farms and in workshops"
Quiz: The fuse and how it protects a circuit
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Practice set: The circuit breaker and how it works
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Practice set: The factors affecting the size of an induced e.m.f.
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Exam prep: The a.c. generator and how it works
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Spot my mistake: The d.c. generator and the commutator
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Quiz: Oersted's experiment and what it showed
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Worked example: The strength of an electromagnet and what affects it
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Practice set: The electric bell and how it operates
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Spot my mistake: The moving-coil galvanometer
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Quiz: Resistance and Ohm's law reviewed
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Worked example: Electrical safety and the cost of energy reviewed
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Quiz: The structure of a transformer and its two coils
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Exam prep: The models of the atom compared, from Thomson to Bohr
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Exam prep: The cloud chamber and the photographic plate as detectors
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Spot my mistake: Assuming a sample decays completely after two half-lives
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Quiz: The scale of the universe and the light year
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Practice set: The Big Bang theory and the evidence for it
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Exam prep: Cosmic microwave background radiation
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Worked example: The earth and the solar system reviewed
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Practice set: Stars and the universe reviewed
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