28 lines
600 B
Markdown
28 lines
600 B
Markdown
|
---
|
||
|
|
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:
|
||
|
|
|
||
|
|
$$
|
||
|
|
\frac{9V} {10,000\Omega} = 0.0009 \textsf{A} (0.9 \textsf{mA})
|
||
|
|
$$
|