The document summarizes the design of a transformer with an input voltage of 220V and output voltage of 110V with an apparent power of 100VA. It describes calculating the core area, turns per volt, primary and secondary windings based on standard formulas. Materials needed include a former, core, copper wire and have a total cost of 560 BDT. The transformer was tested and the results were not described further.

1. Transformer Design
Presented by :
K M Saifulla Riyadh ( 021 171 023)
Abdulla Al Jubayr (021 171 028)

2. INTRODUCTION:
 Input voltage = 220V
 Output voltage= 110V
 Apparent Power=100VA

3. Calculating the core area (CA) of the
transformer
The core are is calculated through the formula given below :
CA=1.152 X √(Output voltage X output current) cm^2
Our CA was =11.55 cm^2

4. Calculating Turns Per volt (TPV)
TPV was calculated by the given formula :
TPV= 1/(4,44 x 10-4 x CA x Flux Density x AC
Frequency)
Our TPV =3.1704

5. Primary Windings Calculation
 Primary Winding Current :
Ipri = ( Secondary Volts x Secondary current) / (Primary Volts x Efficiency)
= 0.4095 A
 Number of Turns In Primary Side:
Npri= TPV x Primary Volts
= 698 Turns

7. Secondary Windings Calculation :
 Number of Turns In Secondary Side:
Nsec= 1.03 x (TPV x Secondary Voltage),
= 360 turns
 Secondary Winding Current :
Isec= apparent power/ Vsec
=0.9091 A

8. Materials And Cost:
Material Name Cost (BDT)
Former ( Bobin) - 1pcs 20
Core ( E & I) – 2 Kg 210
Copper Wire 28 – 150 gm 130
Copper Wire 23- 180 gm 150
Others 50
Total 560

9. Making Procedure:

11. Testing And Result: