TRANSFORMERS

A transformer consists of

• Metal Core

• Metal core and coiled wire

• Metal core and polymer wire

• Polymer core and metal wire

Transformer is device that

• converts AC voltage to current

• converts electrical energy to kinetic energy

• converts AC voltage to a different level at the same amplitude

• converts AC voltage to a different level at the same frequency

Select the facts about transformer.

• Will not work with DC and AC

• Will not work with DC

• AC will produce change in magnetic field

• AC will induce current

Is the core insulated?

• Yes

• No

The insulation at the transformer's core is meant for

• to avoid sharp edges.

• to avoid corrosion.

• to avoid electrical contact.

• to reduce power loss.

Primary loop is connected to the supply while secondary loop is connected to the load.

• True

• False

Step-up transformer is a transformer that increases...

• voltage.

• current.

• resistance.

• conductance.

A secondary coil of a transformer has 500 windings. It was supplied with 200 V. How many windings needed at primary coil to produce 100 V.

A secondary coil of a transformer is supplied with voltage source, while the primary coil induces voltage (emf).

• True

• False

Select the correct characteristics for ideal transformers.

• Zero leakage flux.

• The wire have no resistance.

• No hysteresis or eddy currents.

• Has similar windings at both primary and secondary coils.