Transformer

A transformer is a device that changes the voltage of

• a direct current

• an alternating current

Two types of transformer are in terms of voltage

• step-in transformer

• step-out transformer

• step-down transformer

• step-up transformer

Calculate voltage in the secondary coil based on the information given below.

Vp = 240 V

Np = 20

Ns = 125

Vs ?

• 1500 Turns

• 1500 V

• 1500A

Transformer is always connected to ___________ supply.

• A.C.

• D.C.

Transformer transforms _________ from primary to secondary.

• Only Current

• Only Voltage

• Both Voltage and Current

The core of a transformer is made up of:

• iron

• steel

• copper

Electrical symbol of a TRANSFORMER

• 
• 
• 

The following parts of the transformer are...

• Emitter/base/ collector

• Core/primary coil/secondary coil

• Anode/Cathode

The output voltage in a fly-back transformer of a CRT television is

• 10Kv

• 10V

• 100 Kv

the lose of current in the transformer is because...

• The magnetic field between the core and the coil

• The internal resistance

• the Voltage supplied