1. electrical machine1 J Role@ueab 2006 Transformer Device that changes Electrical energy into magnetic energy Device that changes Electrical energy into magnetic energy Types of Transformer Step down Step down Step up Step up Choke Choke Audio Audio Filter Filter

2. electrical machine1 J Role@ueab 2006 Kinds of Transformer Center Tapped Center Tapped Multiple output transformer Multiple output transformer Ferrite transformer Ferrite transformer

3. electrical machine1 J Role@ueab 2006 E P /E S =N P /N S EP- Voltage applied to the primary Es- voltage generated in the secondary Ip- current demanded by the primary Is- current demanded by the load requirements of the secondary. Np – number of turns in the primary coil Ns- number of turns in the secondary coil

4. electrical machine1 J Role@ueab 2006 A transformer has 2200 turns with primary voltage of 200 V how may turns is required if the transformer input will supplied by the following voltages: a) 210 volts b) 220 Volts c) 230 Volts d) 245 Volts

5. electrical machine1 J Role@ueab 2006 Problem 2 A transformer is supplied by a 220 volt at 15 turns per volts, how many turns is required to produce a 12 Volts and a 30 volts in the secondary or the output of the transformer.

6. electrical machine1 J Role@ueab 2006 Problem 3 A 3 ampere transformer has a secondary output of 24 volts how many turns is required to produced if the computed value of turns is 7 turns per volts? A 3 ampere transformer has a secondary output of 24 volts how many turns is required to produced if the computed value of turns is 7 turns per volts?