Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Creating and Selling a Torch Bag
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Background information When a potential difference is applied across a material that conducts electricity it causes an electrical current in the material. Potential difference is the cause and electric current is the effect. Different currents are caused for a given potential difference depending on the nature of the material, on its shape and on its temperature. As is frequently the case with cause and effects problems, the ratio of the cause to the effect is a useful quantity. Resistance is the name given to the ratio here. Resistance is defined by the following equation: The resistance of a conductor is the ratio of the potential difference applied across it, to the current passing through it. The unit of resistance must be the volt per ampere. This is given the name ohm (?). So the unit of resistance is the ohm, symbol ?. Large resistances are measured is thousands or millions of ohms. So,...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 150,159 others
