Generator — Science definition
A device that uses electromagnetic induction to convert mechanical motion into electrical energy — essentially a motor run in reverse.
Where it is taught
- Magnetism & Electromagnetism — Electricity, Magnetism & Circuits, Physics & Environmental Science, Grade 12
In use
A generator can convert mechanical input into electrical transfer by changing linked magnetic flux.
Magnetism & Electromagnetism
Questions using generator
Problem 1
Answer and explanation
A generator spins a coil of wire inside a magnetic field (or spins a magnet near a coil). The constantly changing magnetic field through the coil induces a voltage by electromagnetic induction, driving a current. It is a motor in reverse because a motor takes in electricity to produce motion, while a generator takes in motion to produce electricity — the same parts, run the opposite way.
Problem 2
- a motor run in reverse, turning motion into electricity
- an insulating device
- a battery that stores charge
- a large resistor
Answer and explanation
a motor run in reverse, turning motion into electricity
A generator has the same parts as a motor but runs in reverse: instead of using electricity to make motion, it uses motion to induce electricity.