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---
title: Ohm's Law
categories:
- Electronics
tags: [physics, electricity, electrical-resistance]
---
# Ohm's Law
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The relationship between [current ](/Electronics/Current.md ), [voltage ](/Electronics/Voltage.md ), and [resistance ](/Electronics/Resistance.md ) is defined by Ohm's Law:
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> 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:
$$
\frac{9V} {10,000\Omega} = 0.0009 \textsf{A} (0.9 \textsf{mA})
$$
