Write a short note on Electric Potential and Ohm’s Law

Electric Potential

  • The electric potential at a point is defined as the amount of work done in moving a unit positive charge from infinity to that point against the electric force.

Volt

  • The SI unit of electric potential or potential difference is volt (V).
  • The potential difference between two points is one volt if one joule of work is done in moving one coulomb of charge from one point to another against the electric force.

1 volt = 1 joule / 1 coulomb

OHM’S LAW

  • A German physicist, Georg Simon Ohm established the relation between the potential difference and current, which is known as Ohm’s Law.

Ohm’s law

  • According to Ohm’s law, at a constant temperature, the steady current ‘I’ flowing through a conductor is directly proportional to the potential difference ‘V’ between the two ends of the conductor.

I ∝ V. Hence, I/V = constant.

The value of this proportionality constant is found to be I/R

Therefore, I =(1/R) V

V = IR

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