Assignment: Ohms Law 3n713t

Introduction In metallic conveyors at a consistent temperature and zero attractive field, the potential distinction over the finishes of the transmitter is corresponding to the present streaming and resistance of the conduit. That is V=IR. Vis the potential difference. I is the current coursing through and R is the resistance (measured in unit ohms). Materials that uncovered the direct relationship exemplified in Ohm's Law is finished up to be ohmic. At the point when a material is no more extended directly corresponding to current, it is then called non-ohmic material. Next is resistance. There are a few elements that influences resistance. To start with, the kind of material. Second, the length. Third, the cross sectional territory. Fourth, the temperature. In an arrangement circuit, at least two resistors are organized in one line. In an arrangement circuit the, the present going through every resistor is the same and the potential contrast, V, over every resistor is specifically relative to the estimation of R. In a parallel circuit, resistors are masterminded in at least two lines. In a parallel circuit the potential distinction, V, over every resistor is the same. The current, I , going through every resistor I conversely relative to the estimation of R.

Objective To investigate the relationship between current and voltage in Ohmic materials. To investigate the characteristic of resistor in series and parallel.

Apparatus 1) Resistors 100Ω, 22Ω and 330Ω 2) Digital multimeter (DMM) 3) Bread board 4) Crocodile clips and jumper wires

Procedure Part 1 Series Circuit

1. A series circuit with one 100Ω, 200Ω, 300Ω resistor is constructed on the circuit board with the power supply connected as shown in Figure 1. 2. The resistance of each resistor before you ON the power supply is measured. Then the equivalent resistance for the circuit is measured and recorded in Table A 3. A theoretical value of the equivalent resistance of the circuit is calculated and recorded in Table A 4. Using Ohm’s Law, the theoretical value of the voltage and current across each resistor is calculated assuming the power supply is 5V. Values are recorded in Table C and D . 5. With the voltage across the power supply set at 5 volts and ON, the voltage drop across each of the resistor is measured. The voltage drops are added. Record your reading in Table C. 6. The current across each resistor is measured using the DMM. The readings are recorded in Table D.

Part 2 – Parallel Circuit

Figure 2 1. A parallel circuit with one 100Ω, 200Ω and 330Ω resistors is constructed on the circuit board with the power supply connected as shown in Figure 2.

2. Resistance for each resistor is measured before you ON the circuit. The equivalent resistance for the circuit is measured and recorded in Table E

3. A theoretical value of the equivalent resistance of the circuit based on the these resistance are calculated and recorded in Table E

4. Using Ohm’s Law, the theoretical value of the voltage and current across each resistor is calculated assuming the power supply is 5V. The calculation are recorded in Table F and G.

5. With the voltage across the power supply set at 5 volts. Put your calculation values in Table F.

6. Current across each resistor is measures using the DMM. The readings are recorded in Table G.

Results

Experimental Theoretical

R1 99.3 100

Resistance of the resistors (series) (Ω) R2 R3 Equivalent resistance 217.4 325.1 641.8 220 330 650 Table A

Experimental Theoretical

R1 0.77 0.77

Voltage across the resistors (series) (V) R2 R3 Total voltage 1.68 2.49 4.93 1.69 2.54 5 Table B

R1

Experimental Theoretical

0.0078 0.0077

Current across the resistors (series) (A) R2 R3 Is the value of current between resistors same? 0.0077 0.0077 yes 0.0077 0.0077 yes Table C

Experimental

R1 99.3

Resistance of the resistors (parallel) (Ω) R2 R3 Equivalent resistance 217.4 325.1 641.8

Theoretical

100

220

330

650

Table D

R1

Experimental Theoretical

4.9 5

Voltage across the resistors (parallel) (V) R2 R3 Is the value of voltage between resistors same? 4.7 4.8 Yes 5 5 Yes Table E

Experimental Theoretical

R1 0.049 0.050

Current across the resistors (parallel) (A) R2 R3 Total current 0.022 0.015 0.086 0.023 0.015 0.088 Table F

Discussions 1. The aggregate voltage over every one of the resistors in the series arrangement is 4.93 V. This shows that the experimental value is lower than the hypothetical esteem. The distinction is 0.07 V.

2. The aggregate current over every one of the resistors in the parallel circuit is 0.086 A. The trial esteem is lower than the hypothetical esteem. The distinction is 0.002 A.

3. The explanations behind the distinction between hypothetical esteem and exploratory esteem Is a result of the components that influences resistance which are the length of wires, the crosssectional zone of wires utilized.

Conclusion As expressed in Ohm's Law, current Is specifically corresponding to voltage. Resistance in this investigation has been kept steady, so the voltage over every resistor in the arrangement circuit relies on upon the estimation of resistance of every resistor, though the voltage over every resistor in the parallel circuit is the same. The current over every resistor in the arrangement circuit ( series ) is the same, though, the current over

every resistor in the parallel circuit relies on upon the estimation of resistance of every resistor.