experiment 8: ohm's law

Question 1

Who investigated the increase in resistance or in potential difference that affects the flow of current through the wire.

Answer 1

george simon ohm

Question 2

what is the relationship btwn the resistance, volts and current

Answer 2

current I flowing through a circuit is directly proportional to the potential difference V

current I flowing through a circuit is and inversely proportional to the resistance R of the circuit

Question 3

R -
V -
I -

Answer 3

R - resistance in ohms, Ω
V - potential difference in volts, V
I - current in amperes, A

Question 4

what are the procedures

Answer 4

A. Preliminaries
B. Variation of Current with Voltage at constant Resistance
C. Variation of Current with Resistance at constant Voltage
D. Variation of Voltage with Resistance at constant Current

Question 5

set up of the circuit
Resistance Box:
Power Supply:
Voltmeter:
Rheostat:
Ammeter
Alligator Clips:

Answer 5

Resistance Box: A device to set different resistance values.
Power Supply: Provides the voltage for the circuit.
Voltmeter: Measures the voltage in the circuit.
Rheostat: A variable resistor to control current or voltage.
Ammeter: Measures the current flowing in the circuit.
Alligator Clips: Wires for connecting the components.

Question 6

Variation of Current with Voltage at constant Resistance

Answer 6

Fix the resistance R of the Resistance Box to 7 ohms.

Slowly adjust the rheostat slider until the voltmeter indicates a reading of 0.5 V.

Vary the voltage in intervals of 0.5 V (0.5 V, 1.0 V, 1.5 V, 2.0 V, 2.5V) by moving the rheostat slider

x axis: current
y axis: voltage

Question 7

Variation of Current with Resistance at constant Voltage

Answer 7

Choose a constant voltage.

Read and record the Ammeter reading corresponding to 5 ohms after fixing the voltage to 2.0 V by
adjusting the rheostat slider.

Vary the resistance R from 5 Ω, 6 Ω, 7 Ω, 8 Ω, and 9 Ω. (Adjust the rheostat slider until the voltmeter reading goes back to 2.0 V before taking the corresponding current reading from the ammeter.)

x axis: reciprocal of resistance 1/ R
y axis: current

Question 8

Variation of Voltage with Resistance at constant Current

Answer 8

Choose a constant current.

Read and record the voltmeter reading corresponding to 5 ohms after fixing the current to 0.2 A by
adjusting the rheostat slider.

Vary the resistance R from 5 Ω, 6 Ω, 7 Ω, 8 Ω, and 9 Ω. (Adjust the rheostat slider until the voltmeter reading goes back to 2.0 V before taking the corresponding current reading from the ammeter.)

x axis: resistance
y axis: voltage