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Institute of Physics
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Episode 106: Electrical Power
From the Institute of Physics, in this learning episode, students calculate electrical power and through discussion, review their understanding of: • current • potential difference • electromotive force (emf) • charge • drift velocity Students are reminded of the idea that power is the rate of doing work (or the rate at which energy is transferred). A range of calculations allow students to explore the relationships between electrical power, current, voltage, resistance and energy transfer. Students also consider the importance in daily life of electric lighting in contexts such as the home, street lighting and the workplace. They consider the power rating of appliances and the rating of suitable fuses to use with them.
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