Page 28 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 6: To measure the voltage & current in series

and parallel circuit

Objectives

At the end of this exercise you shall be able to:
• make the connections of series & parallel electrical circuits
• measure the voltage, current and resistance value in series & parallel circuits
• verify the ohms law in series & parallel circuits.

Requirements

Tools/Equipments/Instruments
• Combination Plier 165mm, • Voltmeter MI, 250 V - 2 Nos.
insulated - 1 No. • Ammeter MI, 10 Amp - 2 Nos.
• Screw driver 150 mm, • Digital Multi meter 3 ½ Digit - 1 No.
insulated stem - 1 No.
• Neon Tester 75mm, 500 V - 1No. Materials/Components
• Electrician Knife Insulated - 1 No. • Connecting PVC patch cards
• Lamp load panel Wooden 1.5 sq.mm - as reqd.
with 4 lamps - 1 No. • DP switch 250 V, 16 A - 1 No.
• 1 Ph. Auto Transformer
0 - 270 V, 5 A - 1 No.

Procedure

TASK 1: Connection of series circuit
1 Draw the circuit diagram of series and parallel circuit.

2 Make the connections of series circuit as per the circuit diagram.
3 Check the connections and switch ON the supply.
4 Note down voltmeter & Ammeter readings.
5 Change the number & value of lamps / resisters and note voltmeter & Ammeter readings.

6 Enter the readings in tabular column and calculate the total resistance, current and voltage drop.
7 Switch OFF the supply and disconnect the circuit.

TASK 2: Connection of parallel circuit
1 Make the connections of Parallel circuit as per the circuit diagram.
2 Check the connections and switch ON the supply.

3 Note down voltmeter & Ammeter readings.
4 Change the number & value of lamps / resisters and note voltmeter & Ammeter readings.
5 Enter the readings in tabular column and calculate the total resistance, current and voltage.
6 Switch OFF the supply and disconnect the circuit.
7 Verify the ohms law and make comparison in series & parallel circuits.

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