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---
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---
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categories:
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categories:
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- Electronics
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- Electronics
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tags: [electricity, circuits]
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tags: [electricity, electrical-fcircuits]
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---
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---
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# Circuits
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# Circuits
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// TODO: Add much more simplified GCSE-level notes on what a circuit is
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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.
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Below is a basic circuit representing a 9-volt [battery]() with a 10,000$\Omega$ resistor attached accross its terminals.
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## Open an short circuits
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A circuit with a break in its loop is called an **open circuit**. When a circuit is open, no current flows.
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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.
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## Ground
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6
Electronics/Ground.md
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6
Electronics/Ground.md
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---
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title: Ground
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categories:
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- Electronics
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tags: [physics, electricity]
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---
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# Ohm's Law
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# Ohm's Law
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The relationship between [current](), [voltage](), and [resistance]() is defined by 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.
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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.
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## Relationship between _resistance_ and _insulation_
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## Relationship between _resistance_ and _insulation_
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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.
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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.
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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.
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## Factors affecting resistance
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## Factors affecting resistance
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> Given that resistance is the opposite of conductance, the relation between the two quantities can be expressed via a recipricol: $R = 1/G$ and $G = 1/R$
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> Given that resistance is the opposite of conductance, the relation between the two quantities can be expressed via a recipricol: $R = 1/G$ and $G = 1/R$
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## Ohm's Law
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The relationship between current, resistance and voltage is expressed in [Ohm's Law](/Electronics/Physics_of_electricity/Ohms_Law.md).
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## Resistors
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## Resistors
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