Mains electricity

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor)

Ad

The Plug

This is what a plug looks like under the cover. The wire colours are the same almost everywhere, but the components and positions will vary depending on where you live.

plug

Be aware that electricity is very dangerous, so don't play around with plugs unless you know what you are doing (and make sure they aren't connected).

symbol for double insulation

This symbol on a specification plate means the product is double insulated and has a fully plastic casing with nothing sticking out. Therefore, it has no earth wire (ground), since there is no risk of the casing becoming live.

Was this helpful? Yes | No | I need help

The fuse is yet another safety measure, they break the circuit if the current is too high, by way of a thin wire breaking. An alternative to fuses is a circuit breaker. These don't have to be replaced like fuses - merely reset. They also work quicker. They work by breaking the circuit when the current in the neutral wire is less than in the live.

Was this helpful? Yes | No | I need help

The Relationship Between Power, Current and Voltage.

The equation triangle below shows the important relationship between power, current and voltage.

power current voltage

Bills

Now we look at how you can calculate the cost of individual appliances, which could help you save money on the electricity bill. Have a look at the example below:

A kettle uses 8kW and is used for a total of 1h30m in a month. Calculate the cost if 1 unit is 7p.

Cost = kWh x cost per unit = 8 x 1.5 x 0.07 = £0.84

Comments

ScienceAid welcomes all comments. If you do not want to be anonymous, register or log in. It is free.




Jamie
Featured Author
166 Articles Started
1,267 Article Edits
42,900 Points
Jamie is a featured author with ScienceAid. Jamie has achieved the level of "Captain" with 42,900 points. Jamie has started 166 articles (including this one) and has also made 1,267 article edits. 9,600 people have read Jamie's article contributions.
Jamie's Message Board
Jamie: Hi, my name is Jamie.
Jamie: Can I help you with your problem about "Mains electricity"?
 

Article Info

Categories : Electricity

Recent edits by: Jamie (ScienceAid Editor)

Share this Article:

Thanks to all authors for creating a page that has been read 3 times.

Do you have a question not answered in this article?
Click here to ask one of the writers of this article
x

Thank Our Volunteer Authors.

Would you like to give back to the community by fixing a spelling mistake? Yes | No