The Ohm's Rule

IMPORTANT

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

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State ohms law with graphical representation.

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Mathematical representation of Ohm's law is:

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

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The resistance of a conducting wire is 3.0 ohm. There is a potential difference of 1.5 volt between the ends of the wire. Find the value of the electric current flowing in the wire.

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A potential difference of 24 V is needed to make a current of 0.06 A flow through a given wire. What potential difference (in volts) is needed to make a current of 150 mA flow through the same wire.

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An observer takes two observations as given below, while performing Ohm’s law experiment : 

S.No. Ammeter reading Voltmeter reading
(i) 0.50 A  2 V
(ii) 0.75 A  3 V

Find the resistance of the conducting wire in ohms.

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The resistivity of manganese wire of length 1 m is 1.84×10-6 Ω m at 20 °C. If the diameter of the wire is 3×10-4 m, what will be the resistance of the wire in at that temperature ? 
 

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Which among the following graphs correctly represents ohms law?

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An electric bulb is connected to a source of 220 V and the current flowing through the circuit is 0.5 A. Calculate the resistance of the bulb in ohms?

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

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Potentiometer can serve as a rheostat.

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

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The slider provided on a rheostat changes the

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Rheostat is a variable resistor.