Ohm’s law

03 Electricity

OHM’S LAW

According to Ohm’s law, at constant temperature and physical conditions, the current flowing through a conductor is directly proportional to the potential difference across its ends.

V α IV = R × IVI = R

where, V is the potential difference measured across the conductor (in volts)
I is the current through the conductor (in amperes)
R is the constant of proportionality called resistance (in ohms)

POINTS TO BE INFERRED FROM OHM’S LAW

  • On doubling of the potential difference across the ends of a conductor e, the current flowing through it also gets doubled, and when the potential difference is halved, the current also gets halved.
  • On doubling of resistance, the current gets halved, and if the resistance is halved, the current gets doubled.
  • Ohm’s law relationship can be remembered using the Ohm’s magic triangle or magic VIR triangle to calculate all formulations of Ohm’s law.

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