250 prompts matching "What the centre of mass is"
Quiz: Optical instruments and the electromagnetic spectrum reviewed
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Practice set: The gravitational field reviewed
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Real-life Nigeria: Linking waves, sound and light together
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Worked example: Coulomb's law and the force between two charges
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Real-life Nigeria: Measuring the current in a Nigerian household circuit
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Worked example: Calculating the work done in moving a charge
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Spot my mistake: Primary cells and secondary cells compared
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Practice set: The ohmic conductor and the non-ohmic conductor
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Quiz: The fuse and how it protects a circuit
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Worked example: Choosing the right fuse rating for an appliance
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Practice set: The circuit breaker and how it works
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Exam prep: The a.c. generator and how it works
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Practice set: The electric bell and how it operates
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Exam prep: The relay and the telephone earpiece
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Worked example: Calculating the force on a current-carrying conductor
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Practice set: The force between two parallel current-carrying conductors
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Exam prep: The simple d.c. motor and how it turns
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Worked example: Calculating output voltage from the turns ratio
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Exam prep: Energy losses in a transformer, and how they are reduced
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Spot my mistake: Assuming a transformer can work on direct current
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