# Formal Report Title Page

**Topics:**Resistor, Series and parallel circuits, Electrical resistance

**Pages:**8 (742 words)

**Published:**December 3, 2014

Title: SERIES-PARALLEL CIRCUITSDate: 15/OCT/2014

Name: AMISH PATEL Student #: 000356107

Lab Partner’s Name: MANPREET SINGH

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In-Class Work and Report Sheets Attached

GRADE: ______________ out of 40

OBJECTIVES:-

1. To apply resistive circuit laws to series-parallel circuits. 2. To apply the voltage divider and current divider principles to series-parallel combination.

APPARATUS:-

1. D.C Power supply

2. Digital multimeter

3. Oscilloscope

4. Breadboard and component kit

PART 1- VOLTAGE AND CURRENT RELATIONSHIPS

Where R1=560 Ω, R2=330 Ω, R3=470 Ω and E=18 V

PROCEDURE:-

1. Construct the circuit as shown in figure #6 on your breadboard that is connect resistor R1 in series with two resistor R2 and R3 which are connected in parallel. 2. Adjust the supply voltage to 18V in D.C Power supply.

3. Measure the values of IT, I1, I2 and I3 with the help of Digital multimeter and note down the readings in table 1. 4. Now Measure the values of V1, V2 and V3 with the help of multimeter and note down the readings in table 1 and table 2 as well. 5. Switch OFF the circuit and disconnect the meters.

6. Now connect Oscilloscope to the circuit and measure the values of V1, V2 and V3 respectively and note down readings in table 2.

OBSERVATION TABLE:-

Current

Measured by DMM

(mA)

Calculated

Value

(mA)

Voltage

Measured by DMM

(Volts)

Calculated Value

(Volts)

IT

24.31

23.87

VT

18

18

I1

24.05

23.87

V1

13.55

13.36

I2

14.12

14.06

V2

4.66

4.64

I3

9.91

9.87

V3

4.66

4.64

Table-1

OBSERVATION:-

If the resistors are connected in series then all the resistors has same amount of current equal to total current, so the current across resistor R1 is same as the total current.

OBSERVATION TABLE:-

Voltage

Measured by DMM

(Volts)

Measured by Oscilloscope

(Volts)

V1

13.55

13.38

V2

4.66

4.67

V3

4.66

4.67

Table-2

OBSERVATION:-

If the resistors are connected in parallel then all the resistors which are connected in parallel has same amount of voltage, so V2 and V3 has same amount of voltage.

CONCLUSION:-

The Relation between Voltage and Current is that the value of current remain same in all the resistors connected in series circuit, while voltage remain same in all resistors connected in parallel circuit. PART 2- RESISTANCE RELATIONSHIPS

Where R1=560 Ω, R2=1.2 KΩ, R3=4.7 KΩ, R4=2.2Ω and R5=2.7 KΩ

PROCEDURE:-

1. Construct the circuit as shown in Figure #7 on your breadboard. 2. Measure the resistance between points X and Y.

3. Leave Points X and Y open circuited and measure the resistance across Points A and B. 4. Now remove the jumper wire which is connected between Points A and P and then measure resistance across RPB and RAB.

OBSERVATION TABLE:-

Resistance between points

Measured Value

KΩ

RXY

1.343

RAB

0.788

RPB

4.83

RAB

0.942

Table-3

OBSERVATION:-

R1 does not affect the results as it is connected in series with R4 and R5.

CONCLUSION:-

The value measure of any resistance of resistor placed in circuit will not affect the resistance of other resistor in the circuit. PART 3- OPEN AND SHORT CIRCUITS

Where R1=3.3 KΩ, R2=2.2 KΩ, R3=1.0 KΩ, R4=2.7 KΩ and R5= 560 Ω

PROCEDURE:-

1. Construct the circuit as shown in Figure #8 on your breadboard. 2. Measure and record the values of all resistor connected in the circuit one by one in table4. 3. Now measure and record the resistance between points (A-B) and points (X-Y). 4. Insert a jumper wire between points X and Y (which means...

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