The iron core is made up of a number of laminations which are stacked together

to form the core .Each lamination is electrically insulated on the outer surfaces to

minimize eddy current flow in the core . Cross section of the stamping is as shown

in Fig 5.2 . It is given that

Dd/deL =0.87

Calculations:

Ai = 230

4.44∗1∗50∗1200

= 8.63*E-4 m2 = 8.63 cm2

dd = Ai

3.1

= 8.63

3.1 = 2.78 cm

del measured = 2.9 cm

del / dd = 1 / 0.87

del theoretical = dd / 0.87

= 3.19 cm

Required no. of turns to get 6V at the secondary

Ns/ N1 = V2 /V1

Ns = N1V2 / V1

= 1200∗6

230≈ 32 turns

Connection Measurement between Multimeter reading

S1 and S2 F1 and F2 12.14

S1 and F2 S2 and F1 0.01

F1 and S2 S1 and F2 12.13

F1 and F2 S1 and S2 0.02

Result:

1. Voltage between S1 and F1 = 6.1V

2. Voltage between S2 and F2 = 6.0V

3. Ai = 8.63cm2 Ns = 32 turns

del experimental = 2.9 cm

del theoretical = 3.19 cm

dd = 2.78 cm

Conclusion:

In case 2nd and case 4th , coils are oppositely connected so the resultant V ≈ 0

while in 1st and 3rd case, the voltage get added and ideally they should be 12V.

The EMF induced in the coil is directly proportional to the number of turns when

coiled on one another.

Precautions:

a) Don’t switch on the circuit until it’s complete and verified by instructor.

b) While using multimeter to measure resistance, we should switch off the circuit.

c) We should wear shoes while doing experiment

d) The innermost coil with 1200 turns should not be opened.

e) Coil should be handled with care.

f) The insulation on the wire should be removed.