Question

In ohm's law experiment, what are the physical quantities/quantity which is/are to be kept constant while doing experiment?
What was the use of rheostat in a circuit to verify ohm's law?
Name the device which is used to maintain constant potential difference between two points of a conductor.
While taking the reading of meter, what should be the position of eye?

Answer 1

In ohm's law experiment, "temperature" is kept constant while doing experiment.

Ohm's law:

• Ohm's law states that if the temperature remains constant, current through the resistor is proportional to the potential difference applied across it.

• As a result, temperature is the physical quantity that must be maintained throughout the experiment.

Use of rheostat

• A rheostat is a device that changes the resistance of a circuit (a variable resistance).

• We utilize a rheostat in the Ohm's law experiment to alter the resistance and so achieve varied current values while keeping the voltage constant.

Use of Cell or battery

• A cell is a chemical device that maintains the potential difference between two conductor sites.

• An electrolysis solution is filled in the cell, which is made up of cathode and anode rods.

• The source that turns chemical energy into electrical energy is the chemical processes that take place between the two opposite electrodes.

Position of eye

• The position of the eye must be vertically above the place where the measurement will be taken.
• It's possible to acquire incorrect readings if the eyes are in different positions.

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Answer 2

Answer:

The "temperature" of an ohm's law experiment is kept constant throughout the experiment.

Ohm's law states:

• According to Ohm's law, current through a resistor is proportional to the potential difference applied across it if the temperature remains constant.

• As a result, the physical quantity of temperature is the one that must be maintained throughout the experiment.

Using a rheostat

• A rheostat is a device that alters a circuit's resistance (a variable resistance).

• In the Ohm's law experiment, we use a rheostat to change the resistance and so produce different current values while keeping the voltage constant.

Use of a battery or a cell

• The potential difference between two conductor sites is maintained by a cell, which is a chemical device.

• The cell, which is made up of cathode and anode rods, is filled with an electrolysis solution.

• The chemical activities that occur between the two opposed electrodes are the source of chemical energy that is converted to electrical energy.

Eyeball position

• The eye must be held vertically above the point where the measurement will be taken.

• When the eyes are in various positions, it is easy to get inaccurate readings.

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