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Electronics/Circuits.md
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---
categories:
- Electronics
tags: [electricity, circuits]
tags: [electricity, electrical-fcircuits]
---
# Circuits
// TODO: Add much more simplified GCSE-level notes on what a circuit is
An electrical circuit is a set of electrical components connected in such a way that current flows in a loop from a voltage source, through the cirucit elements and back to the source.
Below is a basic circuit representing a 9-volt [battery]() with a 10,000$\Omega$ resistor attached accross its terminals.
![](/img/basic-circuit.png)
## Open an short circuits
A circuit with a break in its loop is called an **open circuit**. When a circuit is open, no current flows.
A **short circuit** is a path in a circuit that allows current to flow with little or no resistance. This is usually unintentional and results in excessive current flowing through the circuit. A short circuit is the opposite to an open circuit. With an open circuit there is an infinite resistance between the two terminals.
## Ground

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Electronics/Ground.md Normal file
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---
title: Ground
categories:
- Electronics
tags: [physics, electricity]
---

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Electronics/Physics_of_electricity/Ohms_Law.md
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# Ohm's Law
The relationship between [current](), [voltage](), and [resistance]() is defined by Ohm's Law:
The relationship between [current](/Electronics/Current.md), [voltage](/Electronics/Voltage.md), and [resistance](/Electronics/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.

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Electronics/Resistance.md
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## Relationship between _resistance_ and _insulation_
Resistance and insulation are not the same thing although they relate to the same natural phenomena. Resistance is a propery of an electrical circuit whereas insularity is a property of substances found in the world. Similarly, inulators are naturally occuring materials that resist the flow of current to different degrees whereas a resistor is a man-made electrical component that is used to _control_ the flow of current in a circuit.
The opposite to resistance is **conductance**. Again conductance is not the same thing as a [conductor](/Electronics/Physics_of_electricity/Electrons.md#conductivity-and-insularity): it is a measure of the capacity for current to flow through an electrical component and is function of the fact that certain materials are better conductors than others.
Resistance and insulation are not the same thing although they relate to the same natural phenomena. Resistance is a property of an electrical circuit whereas insularity is a property of substances found in the world. Similarly, insulators are naturally occuring materials that resist the flow of current to different degrees whereas a resistor is a man-made electrical component that is used to _control_ the flow of current in a circuit.
## Factors affecting resistance
@ -38,6 +36,10 @@ The opposite to resistance is **conductance**. Again conductance is not the same
> Given that resistance is the opposite of conductance, the relation between the two quantities can be expressed via a recipricol: $R = 1/G$ and $G = 1/R$
## Ohm's Law
The relationship between current, resistance and voltage is expressed in [Ohm's Law](/Electronics/Physics_of_electricity/Ohms_Law.md).
## Resistors
![](/img/resistor-photo.jpg)