Q.5. a) State the formula showing how the current I in a conductor varies when the potential
difference V applied across it is increased stepwise.
b) Show the relationship also on a schematic graph.
Answers
• In 1828, George Simon Ohm, a German physicist, derived a relationship between electric current and potential difference. This relationship is known as Ohm’s law.
• Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged.
• Mathematically it can be represented
Potential difference ∝ Current
V ∝ I
V = I R
• where constant of proportionality R is called the electric resistance or simply resistance of the conductor.
• If a graph is drawn between the potential difference readings (V) and the corresponding current value (I), then the graph is found to be a straight line passing through the origin
Answer:
• In 1828, George Simon Ohm, a German physicist, derived a relationship between electric current and potential difference. This relationship is known as Ohm’s law.
• Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged.
• Mathematically it can be represented
Potential difference ∝ Current
V ∝ I
V = I R
• where constant of proportionality R is called the electric resistance or simply resistance of the conductor.
• If a graph is drawn between the potential difference readings (V) and the corresponding current value (I), then the graph is found to be a straight line passing through the origin