# Frequent question: What is the potential difference of mains electricity?

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## What is the current of mains electricity?

Alternating current

Mains electricity is an AC supply, and the UK mains supply is about 230 volts. It has a frequency of 50Hz (50 hertz), which means it changes direction and back again 50 times a second.

## What is the PD between neutral wire and earth wire?

The neutral wire is at 0 V (earth potential).

## What is the potential difference between the live wire and the neutral wire in the UK?

Mains cables

The wire covered in brown plastic is the live wire. This carries the 230 V alternating potential difference from the power supply. The wire covered in blue plastic is the neutral wire and this completes the circuit from the appliance back to the supply. It is usually at 0 V.

## How many amps is a UK socket?

A common UK plug is generally fitted with a 3A or 13A fuse. Plugs for appliances rated up to about 700 watts should have a 3-amp fuse (coloured red).

## Is 240V AC or DC?

This milestone marked the decline of DC in the United States. While Europe would adopt an AC standard of 220-240 volts at 50 Hz, the standard in North America would become 120 volts at 60 Hz.

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## How many amps is household current?

In most homes, lighting and small appliance circuits are 15 or 20 amps, and major appliances are on 20, 50 or even 60 amp circuits. Second, the volts flowing through the wires. Volts are a measure of the pressure that causes current to flow through a circuit. Generally, household wiring is 120 or 240 volts.

## Is the UK 230v or 240V?

The voltage used throughout Europe (including the UK) has been harmonised since January 2003 at a nominal 230v 50 Hz (formerly 240V in UK, 220V in the rest of Europe) but this does not mean there has been a real change in the supply.

## What is the potential difference between earth and neutral line?

2. What are the Important Earth and Neutral Differences? Ans: Both earthing and a neutral wire are maintained at zero potential. The major difference between the two is, Earthing provides a grounding point and neutral provides a returning point to the flow of electricity.

## What should the difference in potential measure between the system neutral and the ground?

Normally this point is earthed for various reasons. In an ideal AC system, neutral and earth should be at the same potential, which means the voltage measured between the neutral and the earth should be zero.