Ohm's Law establishes the relationship between voltage, current, and resistance in an electrical circuit, asserting that voltage is directly proportional to current under constant physical conditions. The law is applicable in determining circuit parameters but does not hold for unilateral elements like diodes and transistors. Key concepts include voltage as the electric potential difference, current as the flow rate of charge, and resistance as the opposition to current flow.

1. OHM’S LAW
By – DEEPAK GUPTA
(Lecturer Physics)
NITTTR, Bhopal

3. Session outcomes:-
After this session you will be able to :-
(1)Explain OHM’S LAW
(2)Solve the related problems with OHM’S LAW

4. Potential Difference
It is a measure of energy, per unit of charge,
transferred between two points in a circuit.
Current
It is rate of flow of electric charge

5. How voltage and
currents are
related ?

6. Ohm’s law states that the voltage across a
conductor is directly proportional to the current
flowing through it, provided all physical conditions
and temperatures remain constant.
Mathematically, this current-voltage relationship is written as,
OHM’S LAW

8. Applications of ohm’s law
(1)To determine the voltage, resistance or current of an
electric circuit.
(2)Ohm’s law maintains the desired voltage drop across the
electronic components.
Limitations of Ohm’s Law
Ohm’s law is not applicable for unilateral electrical elements like
diodes and transistors as they allow the current to flow through
in one direction only.

9. Examples of ohm’s law in everyday life

10. Summary
Ohm’s law gives a conductor the relationship between
voltage, current, and resistance.
Voltage measures the electrical potential difference
across two points in a conductor.
Current measures how many electrons flow across a
given point under unit time.
Resistance is how much a wire or conductor resists the
current flow in an electrical circuit.

11. ASSIGNMENT
(1) Is Ohm’s law Universal?
(2) When does Ohm’s law fail?
Q-A SESSION
The SI unit of electrical resistance is _____
current-voltage relationship is given by the formula _____