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📘 How does a transformer change voltage?

See how changing magnetic flux and coil turns convert one alternating voltage into another.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

The core
Primary winding
Faraday's law
Turns ratio
Current tradeoff
Laminations
Winding insulation
Why AC
Grid levels
The complete loop

Questions this course answers

What sets the ideal voltage ratio of a transformer?

The ideal voltage ratio equals the primary-to-secondary turns ratio.

Why are transformer cores laminated?

Thin insulated sheets interrupt circulating eddy-current paths.

What happens to current when voltage is stepped up at roughly constant power?

Power is approximately voltage times current, so a voltage increase requires lower current.

Why does a conventional transformer not operate from a steady battery connection?

Induction needs changing flux; steady DC can drive saturation and overheating.

Where is a step-up transformer typically used in the grid?

High voltage lowers current and resistive transmission losses for a given power.

Grounded in trusted sources

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