Science · 6 pages · 12 min
How a transformer changes voltage
A changing current in one coil induces a voltage in a second coil sharing its magnetic field.
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From the opening
A transformer changes voltage by letting alternating current in one coil make a changing magnetic field through a second coil. That changing field induces a voltage in the second coil, and the number of turns decides how large the new voltage is. The opening covers why the current must keep changing, how turns set the voltage ratio, and why power is not multiplied.
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Inside
- Why the current must keep changing
- How turns set the voltage ratio
- Why power is not multiplied
- What steady direct current fails to do
- Where the idea stops applying
- A distinction worth keeping
Sources
- Faraday induction between two coupled coils
- The turns ratio of a transformer