227 prompts matching "Resistance of a wire from its dimensions and resistivity"
Exam prep: The relay and the telephone earpiece
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Physics at work: The loudspeaker, and how it turns current into sound
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Teach me: Electric charge, current and electromotive force reviewed
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Let me explain: The factors that determine the size of the force
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Exam prep: The simple d.c. motor and how it turns
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Spot my mistake: Confusing Fleming's left-hand rule with the right-hand rule
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Real-life Nigeria: Electric motors in Nigerian homes and industry
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Teach me: What a transformer does, and why it is needed
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Let me explain: Step-up and step-down transformers
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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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Let me explain: Atomic number, mass number and isotopes
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Real-life Nigeria: The nucleus as the source of nuclear energy
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Teach me: What radioactivity is, and why some nuclei are unstable
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Worked example: Writing an equation for alpha decay and for beta decay
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Exam prep: The cloud chamber and the photographic plate as detectors
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Spot my mistake: Background radiation, and allowing for it
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Worked example: Calculating the mass remaining after a number of half-lives
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Exam prep: Carbon dating and how it works
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Real-life Nigeria: Radioisotopes in Nigerian medicine and agriculture
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