Ohm's Law - MeitY OLabs
amritacreate
Experiment:
Determination of Resistance per Centimeter and Resistivity of a Wire
The aim of this experiment is to determine the resistance per centimeter of a given wire by
plotting a graph of potential difference versus current and hence to determine its resistivity.
To conduct the experiment,
the following apparatus is required:
● Screw gauge
● Battery
● One-way key
● Rheostat
● Voltmeter
● Ammeter
● Measuring scale
● Resistance wire
Procedure
Connect the positive terminal of the battery to the positive terminal of the ammeter
using a connecting wire. Connect the negative terminal of the ammeter to the positive
terminal of the voltmeter using a connecting wire. The negative terminal of the voltmeter is
connected to the upper terminal of the rheostat using a piece of wire.
Connect the lower terminal of the rheostat to one end of the one-way key, that is, the key
should be removed using a connecting wire.
The other free end of the one-way key is connected to the negative terminal of the
battery.Take a resistance wire, stretch it, and measure its length using a meter scale. Cut the
wire at the given point. Connect it in parallel to the terminals of the voltmeter, that is, positive
to negative. The connection is completed.
Insert the key and slide the rheostat contact to check the working of the ammeter
and voltmeter. Adjust the sliding contact of the rheostat and note down the value of potential
difference V from the voltmeter and current I from the ammeter.
Record the reading of the voltmeter and ammeter. Shift the rheostat contact slowly
and record the reading of the voltmeter and ammeter and calculate the value of resistance
(R) in each case.
Similarly, take at least 5 sets of independent observations and record the readings
and plot a graph with the values.
amritacreate
Experiment:
Determination of Resistance per Centimeter and Resistivity of a Wire
The aim of this experiment is to determine the resistance per centimeter of a given wire by
plotting a graph of potential difference versus current and hence to determine its resistivity.
To conduct the experiment,
the following apparatus is required:
● Screw gauge
● Battery
● One-way key
● Rheostat
● Voltmeter
● Ammeter
● Measuring scale
● Resistance wire
Procedure
Connect the positive terminal of the battery to the positive terminal of the ammeter
using a connecting wire. Connect the negative terminal of the ammeter to the positive
terminal of the voltmeter using a connecting wire. The negative terminal of the voltmeter is
connected to the upper terminal of the rheostat using a piece of wire.
Connect the lower terminal of the rheostat to one end of the one-way key, that is, the key
should be removed using a connecting wire.
The other free end of the one-way key is connected to the negative terminal of the
battery.Take a resistance wire, stretch it, and measure its length using a meter scale. Cut the
wire at the given point. Connect it in parallel to the terminals of the voltmeter, that is, positive
to negative. The connection is completed.
Insert the key and slide the rheostat contact to check the working of the ammeter
and voltmeter. Adjust the sliding contact of the rheostat and note down the value of potential
difference V from the voltmeter and current I from the ammeter.
Record the reading of the voltmeter and ammeter. Shift the rheostat contact slowly
and record the reading of the voltmeter and ammeter and calculate the value of resistance
(R) in each case.
Similarly, take at least 5 sets of independent observations and record the readings
and plot a graph with the values.
