# answer assignment

**Topics:**Kirchhoff's circuit laws, Volt, Electrical measurements

**Pages:**4 (332 words)

**Published:**October 28, 2013

OBJECTIVE: VERIFICATION OF KIRCHHOFF’S LAWS

i) Kirchhoff’s current law(KCL)

ii) Kirchhoff’s voltage law(KVL)

APPARTAUS REQUIRED:

Sl no.

Apparatus

Type

Range /specification

Qty.

1

Experimental board

Kit or

Bread Board

1

2

Power supply

DC

9V & 5V

1

3

VOLTMETER

Moving-Iron

0-15V

1

4

AMMETER

Moving-Iron

0-100mA

1

5

CONNECTING WIRES

As required

THEORY:

I) Kirchhoff’s current law (KCL): It states that the total algebraic sum of current meeting at the junction is zero. This law is based on the principle of conservation of charges.

KCL at junction “O”

I1+ I2+ I3+ I4 - I5 - I6 =0

Therefore, I1+ I2+ I3+ I4 = I5+I6

CIRCUIT DIAGRAM:

PROCEDURE:

i) Connect the circuit. As shown in circuit diagram.

ii) Switch on the power supply.

iii) Note the reading of ammeter

OBSERVATION TABLE:

Sl no.

I1 (A)

practically

I2 (A)

practically

I3 (A)

practically

I3 (A)

calculated

I3 = I2+I1

CALCULATION OF CURRENT “I3”

I3 = I2+I1

RESULT:

Add the reading of ammeter 1(A1) & ammeter 2(A2) and it will be equal to reading of ammeter 3(A3) I3 = I2+I1

KCL is verified.

PRECAUTION:

i) All connection should be tight.

ii) Before connecting the instruments check their zero reading. iii) The terminal of the resistance should be properly connected.

ii) Kirchhoff’s voltage law (KVL):

It states that the algebraic sum of voltage through a closed loop is zero. This law is based on the principle of conservation of energy,

Where, is the branch voltage of close path.

CIRCUIT DIAGRAM:

PROCEDURE:

iv) Connect the circuit. As shown in circuit diagram.

v) Switch on the power supply

vi) Note the reading of voltmeter. V1,V2,V3 (with polarity)

.

OBSERVATION TABLE:

Sr No

Supply voltage

V1

V2

V3

(Mesh 1)

(Mesh 2)

1

9V

2

5V

3

9V & 5V

RESULT:

The algebraic sum of...

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