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Institute of Physics
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Episode 121: Electromotive Force and Internal Resistance
In this learning episode, from the Institute of Physics, students derive the equation relating electromotive force (emf), terminal potential difference, current and internal resistance. They then tackle questions about the internal resistance of a power supply.
The activities include:
• deriving the equation relating emf, terminal pd, current and internal resistance
• practical effects of internal resistance
• student questions on the internal resistance of a power supply
• measuring internal resistance and emf
• discussing the practical importance of internal resistance
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EMF and internal resistance 112 KB
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