Question

Write ohm's law.

Answer 1

For homogeneous part of the circuit

$\displaystyle I = \frac{V}{R}$

where

$V$ - voltage

$I$ - current

$R$ - total resistance of the one or more elements

If the is a source with internal resistance, Ohm's law can be written as

$\displaystyle I = \frac{\varepsilon}{r + R}$

where

$I$ - current in the circuit

$r$ - internal resistance of the current source

$R$ - resistance of the circuit

$\varepsilon$ - electromotive force.