IG Phy -Electromagnetic Induction(IV)

Transformers were first designed by Michael Faraday around 1830.

A transformer works with both direct and alternating current.

In a step-up transformer, the primary coil has more turns than the secondary coil.

Step-up transformers are used to increase the magnitude of the output voltage.

High-voltage transmission cables have large currents.

Step-down transformers are used to bring down high voltages to safer levels for domestic use.

An alternating current in the primary coil of a transformer produces an alternating magnetic field in this coil.

The iron core of a transformer decreases the strength of the magnetic field.

The turn-ratio equation can be used to calculate the output voltage of a transformer.

When the secondary coil has fewer turns than the primary coil, the voltage increases.

Transformers can be used to change both voltage and current levels.

A step-down transformer is used to increase the voltage from 230 V to 400 kV.

The output voltage of a transformer is smaller than the input voltage in a step-down transformer.

If a transformer were 100% efficient, the input power would equal the output power.

To minimize power loss in transmission cables, the current must be kept as high as possible.