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.

$V\alpha I\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}V=R\times I\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\frac{V}{I}=R$

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)

- 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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