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Electromagnetic induction, generators and transformers

Magnetism and electromagnetism · Lesson 4 of 4

Lesson 4 of 4

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Lesson 4 of 4 · Magnetism and electromagnetism

Electromagnetic induction, generators and transformers

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By the end you’ll be able to

describe electromagnetic induction as the production of a potential difference across a conductor when there is relative motion between the conductor and a magnetic field, or when the magnetic field linking the conductor changes
explain how the size of the induced potential difference or current depends on factors such as speed of movement, strength of magnetic field, number of turns and orientation

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explain the difference between direct current and alternating current and interpret simple a.c. waveforms in terms of variation of current or potential difference with time

explain how generators produce electricity by electromagnetic induction, including the operation of a rotating coil in a magnetic field and the distinction between a.c. generators and d.c. generators using slip rings or a split-ring commutator

explain how transformers work only with alternating current, use the relationships $$\frac{V_p}{V_s} = \frac{N_p}{N_s}$$ and, where required, $$V_p I_p = V_s I_s$$ for an ideal transformer, and evaluate step-up and step-down transformers in the transmission of electrical power

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