--- tags: [physics, electricity] --- # Ohm's Law The relationship between [current](Current.md), [voltage](Voltage.md), and [resistance](Resistance.md) is defined by Ohm's Law: > The current flowing from one point to another is equal to the voltage accross > these points divided by the resistance between them. $$ I = \frac{V}{R} $$ As an application, consider a circuit with a 9V battery with a 10,000 $\Omega$ resistor attached across its terminals. The current flowing through the resistor can be calculated as follows: $$ \frac{9V} {10,000\Omega} = 0.0009 \textsf{A} (0.9 \textsf{mA}) $$