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Electronics/Voltage.md
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@ -52,18 +52,6 @@ As they move through the circuit the electrons encounter a **load** which is wha
These examples demonstrate that the voltage rise: voltage drop ratio always evens out. These examples demonstrate that the voltage rise: voltage drop ratio always evens out.
## Ground: zero potential
We use the term **ground** to refer to zero potential - the point at which there is no difference of potential (voltage) that could generate current.
We need ground to prevent electric shock from appliances and circuits. It keeps all devices at the same potential.
In domestic settings appliances are **earth grounded**. The name comes from the fact that all appliances will ultimately connect to the earth to neutralise potential. This means there can be no difference of potential between circuits.
In electronics ground doesn't refer to the specific appliance but is a concept of a zero reference point against which all voltages are measured. A measured voltage will be negative or positive with respect to ground. This said, all circuitry will also have a physical mechanism of discharging potential.
// TODO: Don't really understand this so return to with better explanation
## Distinguishing _voltage_ from _electric field_ ## Distinguishing _voltage_ from _electric field_
It can be confusing that two different symbols often seemed to be used interchangeably when talking about voltage: $V$ and $E$. However, while they broadly point to the same phenomenon there is a difference in emphasis. It can be confusing that two different symbols often seemed to be used interchangeably when talking about voltage: $V$ and $E$. However, while they broadly point to the same phenomenon there is a difference in emphasis.