230 prompts matching "Current gain of a transistor from given base and collector currents"
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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Let me explain: The field pattern around a straight wire and around a coil
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Exam prep: The relay and the telephone earpiece
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Let me explain: Series and parallel circuits reviewed
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Let me explain: The factors that determine the size of the force
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Worked example: Calculating the force on a current-carrying conductor
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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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Worked example: Writing the nuclide notation for a given atom
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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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