Asked in Electrical Engineering
Electrical Engineering
What does a transformer do to current and voltage?
Answer

Wiki User
November 14, 2012 6:33AM
A transformer is used to step up (increase) or step down (decrease) an alternating voltage with very little loss of energy.
Related Questions
Asked in Electrical Engineering
What is current voltage transformer?

A current transformer is a transformer that takes a ratio of
primary current, and delivers this ratio to the secondary. The
voltage across the primary will be insignificant, and the voltage
across the secondary is dependent upon the resistive burden put
across it (since the current is a constant ratio of the primary
current).
A voltage transformer is a transformer that takes a ratio of
primary voltage and steps this down to a specific secondary
voltage. Primary current is typically very small and secondary
voltage is typically very small.
A power transformer is a voltage transformer that is designed
for "large" primary and secondary currents.
Asked in Science, Home Electricity, Physics
Why does the current in a transformer fall when voltage increases?

In common with most electrical circuits, when the voltage supply
to a transformer is increased, the current through the windings
also increases.
However, when the current drawn from the transformer increases
(with the supply voltage unchanged), the voltage output from the
transformer will be reduced.
Asked in Home Electricity, Electrical Engineering, Electrical Wiring
What is the difference betwen current transformer and potential transformer?

A current transformer is a donut (toroidal) shaped transformer.
You use it to measure current (expressed in amperes). You
run your wire to be measured through the transformer and it
produces a variable output based on the current.
A potential transformer is basically a high ratio transformer
that is used to measure voltage on high-voltage lines. For example:
They will use a 10:1 ratio potential transformer to convert 4160v
to 416v. Then they can measure this lower voltage with a meter. The
meter then applies a user programmed multiplier (10) to this number
to calculate the voltage.