1. Practicals -Transformer
Module 1

2. TR= Np/Ns =Vp / Vs= Is/ Ip
Remember the formula
TR= Np/Ns =Vp / Vs= Is/ Ip

3. Lab Activity 1- To measure the primary and secondary voltage of the transformer
Connect the primary in parallel as shown in the picture

4. Circuit Diagram
Sketch the circuit for the parallel connection. It would be as follows:

5. Now measure the primary voltage using the multimeter on. AC 200V range
Now measure the primary voltage using the multimeter on . AC 200V range. Primary Voltage=______V AC

6. Next measure the secondary voltage using the multimeter on AC (200V range). Secondary Voltage Vs1=______V AC Secondary Voltage Vs2=______V AC Are both equal? Why?

7. Lab Activity 3- To calculate the transformer power loss
Connect the primary in parallel and secondary in series as shown in the picture. Also connect the resistor load module with the 2 resistors in series ( = 440 Ω). Measure the primary and secondary voltage
Measure the primary current and secondary current

8. Measuring Primary Current

9. Measuring Secondary Current

10. Measure the following:
Transformer primary voltage = ____VAC
Transformer primary current = ____mA= ____ A
Transformer primary power = VpxIp = ____W
Transformer secondary voltage= __VAC
Transformer secondary current = ___mA=___ A
Transformer secondary power = VsxIs ____W

11. Calculate the following:
Transformer Efficiency= ____ %
Transformer input-output voltage ratio = Vp/Vs = ____
Transformer input-output current ratio = Is/Ip = ____
What do you observe about the relation between voltage, current and Turns ratio?