214 prompts matching "Why solids, liquids and gases expand when heated"
Exam prep: Current in a metallic conductor and in an electrolyte
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Let me explain: The voltmeter and how it is connected
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Practice set: Internal resistance and the lost volts
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Exam prep: Cells connected in series and in parallel
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Real-life Nigeria: The maintenance and charging of a car battery
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Teach me: What resistance is, and what it depends on
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Let me explain: Resistivity and the factors affecting resistance
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Worked example: Calculating resistance from voltage and current
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Practice set: The ohmic conductor and the non-ohmic conductor
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Real-life Nigeria: Resistors and rheostats in practical circuits
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Exam prep: The advantages and disadvantages of a series connection
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Exam prep: Combining series and parallel sections in one circuit
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Real-life Nigeria: Why house wiring uses parallel connection
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Practice set: The circuit breaker and how it works
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Exam prep: Electrical energy, power and the cost of consumption
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Let me explain: Lenz's law and the direction of an induced current
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Exam prep: The a.c. generator and how it works
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Let me explain: The field pattern around a straight wire and around a coil
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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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