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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