In 1827, a German physicist Georg Simon Ohm (1787–1854) found out the relationship between the current (I), flowing in a metallic wire and the potential difference(V) across its terminals. The potential difference, V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. This is called Ohm’s law.
In other words –˃ V ∝ I , V/I = constant =˃ R
The following graph is obtained by a student while doing an experiment to see the variation
of potential difference(V) with respect to the current (I) .
(i). What is the mathematical formula of ohms’ law? (a) V = I R (b) V = I (c) V = R (d) V= R/V
(ii) By taking the slope (gradient) of the straight line, which of the following quantity can be deduced.
(a) Resistance of the conductor
(b) current flowing through the circuit
(c) voltage across the terminals of the battery (d) none of these
(iii). If the potential difference across the two ends of a conductor is 1 V and the current through it is 1 A, then the resistance R, of the conductor is
(a) 1 ohm (b) 2 ohm (c) 3 ohm (d) 4 ohm
(iv) The current through a resistor is inversely proportional to its
(a) voltage (b) resistance (c) temperature (d) none of these
(v) When temperature of a metallic conductor increases that time resistance value
(a) increases (b) decreases (c) remains same (d) none of these
Answers
I = V/R is the OHM's LAW
Explanation:
Ohm's Law
Current flowing through a conductor is directly proportional to the potential difference across its ends
I ∝ V
=> I = V/R
Mathematica Formula of OHM's Law
V = IR from given options.
By taking the slope (gradient) of the straight line - Resistance of the conductor can be deduced.
If the potential difference across the two ends of a conductor is 1 V and the current through it is 1 A, then the resistance R, of the conductor is
1/1 = 1 ohm
The current through a resistor is inversely proportional to its resistance
When temperature of a metallic conductor increases that time resistance value increases
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