Generators & Transformers

Powering the world

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Generators spin coils in magnetic fields, producing alternating current (AC).
• Transformers: $V_s/V_p = N_s/N_p$. They only work with AC.
• An ideal transformer conserves power: stepping the voltage up steps the current down.

Steps

1. Where electricity comes from
2. Alternating current
3. Turn the coil
4. Transformers
5. Phone charger
6. Mains frequency
7. Power is conserved