The Ohm's Rule
The Ohm's Rule: Overview
This topic covers concepts such as Ohm's Law, V-I Graph, Rheostat, Resistor, Verification of Ohm's Law Using Voltmeter and Ammeter.
Important Questions on The Ohm's Rule
State ohms law with graphical representation.

Mathematical representation of Ohm's law is:

Name the device that is used to regulate current in a circuit by changing the resistance gradually.

The resistance of a conducting wire is . There is a potential difference of between the ends of the wire. Find the value of the electric current flowing in the wire.

A potential difference of is needed to make a current of flow through a given wire. What potential difference (in volts) is needed to make a current of flow through the same wire.

An observer takes two observations as given below, while performing Ohm’s law experiment :
S.No. | Ammeter reading | Voltmeter reading |
Find the resistance of the conducting wire in ohms.

The resistivity of manganese wire of length is at . If the diameter of the wire is , what will be the resistance of the wire in at that temperature ?

Which among the following graphs correctly represents ohms law?

An electric bulb is connected to a source of and the current flowing through the circuit is . Calculate the resistance of the bulb in ohms?

Give circuit diagram of experimental verification of ohm's law.

Potentiometer can serve as a rheostat.

Resistance increases by increasing the _________ of the coil carrying the current in a rheostat.

The slider provided on a rheostat changes the

Rheostat is a variable resistor.
