Lab#05: KVL & Voltage Divider Rule SSUET/QR/114

LAB#05

OBJECTIVE

Verification of KVL & Voltage Divider Rule.

EQUIPMENT REQUIRED

· Multi Meter

· DC Power Supply

· Different Valued Resistors

· Bread Board

THEORY

KVL

Around any complete circuit the algebraic sum of the voltage rise equals the sum of voltage drops.

Voltage Divider Rule

The Voltage Divider Rule can be given by

Vx = (Rx/Req) V

Where,

V = voltage across / supplied to any series circuit

Req = equivalent resistance of the series circuit = ΣRi

Rx = any particular resistor in the series circuit

Vx = voltage across Rx.

If, i = 3 then ΣRi = R1+R2+R3

CIRCUIT DIAGRAM

Figure 5.1

PROCEDURE

· Connect three resistors R1 & R2 & R3 in series to a DC power supply as shown

In Figure 5.1 Set V = 10 V.

· Take readings of V1, V2 & V3 using voltmeter.

· Verify KVL (V = V1 + V2 + V3).

· Verify Voltage Divider Rule using the equation Vx = (Rx/Rs) V

OBSERVATION

TABLE 5.1

Nominal Value / Measured Resistance
R1 =
R2 =
R3 =

TABLE 5.2

MEASURED VALUES

Voltage across R1 = ______

Voltage across R2 = ______

Voltage across R3 = ______

Total voltage = ______

CALCULATED VALUES

Voltage across R1 = ______

Voltage across R2 = ______

Voltage across R3 = ______

Total voltage = ______

EXERCISE

Q1)Three resistors 3.30 kΩ, 1.005 kΩ and 470 Ω are connected in series. Calculate the equivalent resistance Rs. ______

Q2) 10.00 volts is applied across three resistors in series and a current of 1.00 mA is recorded by the ammeter in the circuit. A voltage of 4.50 V is measured across the first resistor R1 and a voltage of 2.20 V is measured across the second resistor R2. Use Kirchoff’s Law to determine the resistance of the third resistor R3. ______

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