Generators & Dynamos
2 guided lessons · 18 checks · 6. Magnetism and Electromagnetism → Electromagnetic Induction
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Generators: rotation into electricity
A generator is induction industrialised: a coil spins in a magnetic field — or a magnet spins inside a coil — and the changing field induces a voltage. Because the rotation keeps changing the field's direction, the output voltage alternates, which is why generators are the AC sources of the grid.
What you know already
Spin a magnet in a coil — or a coil in a field — and rotation becomes electricity: the generator is induction put to work. This note covers both rotation arrangements, the three size factors, and the split-ring commutator that turns a dynamo's alternating induction into one-way direct delivery.
Key points of understanding
- Electricity is generated by rotating a magnet within a coil of wire.
- Electricity is also generated by rotating a coil of wire inside a magnetic field.
- The rotation changes the field through the coil, inducing a voltage.
- The induced voltage alternates because the rotation reverses the field change each half turn.
- Larger induced voltages come from faster rotation, stronger fields and more turns.
An alternator is a rotating coil in a magnetic field with slip rings
a.c output from an alternator - the current is both in the positive and negative region of the graph
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1.Generators: rotation into electricity
A generator is induction industrialised: a coil spins in a magnetic field — or a magnet spins inside a coil — and the changing field induces a voltage. Because the rotation keeps changing the field's direction, the output voltage alternates, which is why generators are the AC sources of the grid.
An alternator is a rotating coil in a magnetic field with slip rings
a.c output from an alternator - the current is both in the positive and negative region of the graph
Key points
- Electricity is generated by rotating a magnet within a coil of wire.
Guided content from the SME authoring corpus — note rn_dRYCKprDDBys3j4W, pinned at 6312d659ec0d · promoted SyllabAI/syllabai-resources b3caaaa90c5e
