---
title: Ohm's Law
categories:
  - Electronics
tags: [physics, electricity]
---

# Ohm's Law

The relationship between [current](/Electronics_and_Hardware/Analogue_circuits/Current.md), [voltage](/Electronics_and_Hardware/Analogue_circuits/Voltage.md), and [resistance](/Electronics_and_Hardware/Analogue_circuits/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:

$$
\frac{9V} {10,000\Omega} = 0.0009 \textsf{A} (0.9 \textsf{mA})
$$
