Step-up transformer

Definition

A step-up transformer increases the voltage from the primary coil to the secondary coil while decreasing the current. It is commonly used in power transmission to reduce energy loss over long distances.

5 Must Know Facts For Your Next Test

1. The primary coil of a step-up transformer has fewer turns than the secondary coil.
2. The voltage increase in a step-up transformer is directly proportional to the ratio of the number of turns in the secondary coil to the number of turns in the primary coil.
3. Step-up transformers are essential for efficient long-distance electrical power transmission.
4. The power output (in watts) remains approximately equal to the power input, assuming an ideal transformer with no losses.
5. A step-up transformer decreases current proportionally as it increases voltage, following the conservation of energy principle.

Review Questions

• What happens to the voltage and current when using a step-up transformer?
• How does the turn ratio between primary and secondary coils affect a step-up transformer's function?
• Why are step-up transformers crucial for long-distance power transmission?

Related terms

Primary Coil:

The coil in which alternating current is initially applied in a transformer.

Secondary Coil:

The coil in which induced electromotive force (EMF) or voltage is generated by magnetic induction from the primary coil in a transformer.

Turn Ratio: The ratio of the number of turns in the secondary coil to the number of turns in the primary coil, determining how much voltage is stepped up or down.