LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
FAKULTI KEJURUTERAAN MEKANIKAL
UNIVERSITI TEKNOLOGI MALAYSIA
KAMPUS SKUDAI
JOHOR
SKMM 2921
ELECTRIC LABORATORY
EXPERIMENT-1
VOLTAGE AND CURRENT
TRANSFORMATION
Prepared by:
1. Dr. Bambang Supriyo
Approved by: Head of Department
Name:
Signature and Stamp:
Signature and Stamp:
Date:
Date:
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
I.
PRELIMINARY EXERCISE
Important Note: You are required to do this BEFORE the lab session
1. Search in the various literature sources, at least five (5) sources, (book, journal,
proceeding, conference paper or internet) and write short introduction, basic theory of
transformer in terms of turn ratio, voltage ratio, current ratio and power ratio, and list
some losses that effect on the transformer performance.
2. List down your literature sources and use as Reference in your Laboratory Short Report.
3. For an ideal transformer, if the primary coil has 1000 turns and secondary has 500 turns,
calculate :
a. Turn Ratio
b. Voltage ratio
c. Current Ratio
d. Power Ratio
4. For an ideal transformer, if the primary coil has 500 turns and secondary has 1000 turns,
calculate :
a. Turn Ratio
b. Voltage ratio
c. Current Ratio
d. Power Ratio
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
II. EXPERIMENT
Voltage and Current Transformation
1. Aims:
a. To build a simple transformer and measure their voltages and currents
b. To determine turn ratio, voltage ratio, current ratio and power ratio of the
transformer
2. Equipments
No.
1
2
3
4
5
6
7
8
9
10
11
12
Quantity
1
1
1
1
1
4
2
2
1
1
2
1
Item
Rastered socket panel
Coil-500 turns
Coil-1000 turns
U-Core Transformer
I-Core Transformer
Bridging plug
Connecting lead, red, 25 cm
Connecting lead, blue, 25 cm
Connecting lead, red, 50 cm
Connecting lead, blue, 50 cm
Multimeter (Voltmeter, Amperemeter)
AC Power Supply (3V, 6V, 9V, 12Vac)
Code
576 74
590 83
590 84
593 21
593 21
501 48
500 411
500 412
500 421
500 422
3. Procedure
Precaution: Make sure the AC power supply switch is turned off before starting the
experiment.
Initial set up: insert the two coils into the U-core and screw the yoke to the U-core
securely with the bare side inward.
a. Voltage Transformation of Step-Up Transformer with no load
1. Use 500-turn coil as primary coil and 1000- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 1.
3. Select voltage level of 3V from the AC power supply.
4. Check carefully to ensure the circuit connections is correct.
5. Turn on the AC power supply switch.
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
6. Measure the voltages of the primary coil (V1) and secondary coil (V2), and record
in Table 1.
7. Repeat steps (a.6) by selecting voltage level of 6V, 9V and 12V AC, respectively.
8. Turn off the AC power supply switch
AC POWER SUPPLY
AC VOLTMETER-1 (V1)
ON
6V 9V
3V
12V
OFF
Vac
COM V~
Bridging Plug
Power Switch
COM V~
AC VOLTMETER-2 (V2)
Primary Coil
Secondary Coil
Figure 1.
b. Voltage Transformation of Step-Up Transformer with load
1. Use 500-turn coil as primary coil and 1000- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 2.
3. Connect the Resistor of 10 k Ohm to the secondary coil.
4. Select voltage level of 3V from the AC power supply.
5. Check carefully to ensure the circuit connections is correct.
6. Turn on the AC power supply switch.
7. Measure the voltage of the primary coil (V1) and secondary coil (V2), and record
these values in Table 2.a.
8. Repeat step (b.6) by selecting voltage level of 6V, 9V and 12V AC, respectively.
9. Repeat step (b.4) to step (b.8) for Resistor of 1 k Ohm (Table 2.b.) and 100 Ohm
(Table 2.c), respectively.
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
10. Turn off the AC power supply switch.
AC POWER SUPPLY
AC VOLTMETER-1 (V1)
ON
6V 9V
3V
12V
OFF
Vac
COM V~
Bridging Plug
Power Switch
COM V~
AC VOLTMETER-2 (V2)
Primary Coil
Secondary Coil
Figure 2.
c. Current Transformation of Step-Up Transformer with load
1. Use 500-turn coil as primary coil and 1000- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 3.
3. Connect the Resistor of 10 k Ohm to the secondary coil.
4. Select voltage level of 3V from the AC power supply.
5. Check carefully to ensure the circuit connections is correct.
6. Turn on the AC power supply switch.
7. Measure the currents of the primary coil (I1) and secondary coil (I2), and record
these values in Table 2.a.
8. Repeat step (c.7) by selecting voltage level of 6V, 9V and 12V AC, respectively.
9. Repeat step (c.4) to step (b.8) for Resistor of 1 k Ohm (Table 2.b) and 100 Ohm
(Table 2.c), respectively.
10. Turn off the AC power supply switch.
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
AC AMPEREMETER-1 (I1)
AC POWER SUPPLY
AC AMPEREMETER-2 (I2)
ON
6V 9V
3V
12V
OFF
A~ COM
A~ COM
Vac
Power Switch
Resistor
Primary Coil
Secondary Coil
Bridging Plug
Figure 3.
d. Voltage Transformation of Step-Down Transformer with no load
1. Use 1000-turn coil as primary coil and 500- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 1.
3. Select voltage level of 3V from the AC power supply.
4. Check carefully to ensure the circuit connections is correct.
5. Turn on the AC power supply switch.
6. Measure the voltages of the primary coil (V1) and secondary coil (V2), and record
these values in Table 3.
7. Repeat steps (d.6) by selecting voltage level of 6V, 9V and 12V AC, respectively.
8. Turn off the power switch of the AC power supply.
e. Voltage Transformation of Step-Down Transformer with load
1. Use 1000-turn coil as primary coil and 500- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 2.
3. Connect the Resistor of 10 k Ohm to the secondary coil.
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LAB SHEET-Experiment-1
ELECTRIC LAB (SKMMV2921), FKM UTM SKUDAI
4. Select voltage level of 3V from the AC power supply.
5. Check carefully to ensure the circuit connections is correct.
6. Turn on the AC power supply switch.
7. Measure the voltage of the primary coil (V1) and secondary coil (V2), and record
these values in Table 4.a.
8. Repeat step (e.7) by selecting voltage level of 6V, 9Vand 12V AC, respectively.
9. Repeat step (e.4) to step (e.8) for Resistor of 1 k Ohm (Table 4.b) and 100 Ohm
(Table 4.c), respectively.
10. Turn off the AC power supply switch.
f. Current Transformation of Step-Down Transformer with load
1. Use 1000-turn coil as primary coil and 500- turn as secondary coil.
2. Set up the experimental circuit as shown in Figure 3.
3. Connect the Resistor of 10 k Ohm to the secondary coil.
4. Select voltage level of 3V from the AC power supply.
5. Check carefully to ensure the circuit connections is correct.
6. Turn on the AC power supply switch.
7. Measure the currents of the primary coil (I1) and secondary coil (I2), and record
these values in Table 4.a.
8. Repeat step (f.7) by selecting voltage level of 6V, 9Vand 12V AC, respectively.
9. Repeat step (f.4) to step (f.8) for Resistor of 1 k Ohm (Table 4.b) and 100 Ohm
(Table 4.c), respectively.
10. Turn off the AC power supply switch.
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