14/09/09

Moving charges

You can do some hair racing experiments with van de graaff generator.this is a machine for building up and storing electric charges when it is switched on,negative charges collect on the dome.the dome becomes negative charges .

Storing charge:if you stand on a prece of plastic and touch the dome,you body connects extra negative charge from the dome.thats when your hair stands on end.each hair becames negatively charge the hairs repel each other .

Losing charge:if you then touch a water tap,your body loses this charges you hair goes bag to normal .the charges flow for body a long the water pipe to the earth you can feel them go your fingers tingle.

Flow a charges: there are two good ways of chowing this flow of charge you can connect a neon bulb between the generation and the water tap.the bulb glose as the charges flow through it you can also connect in a meter wich measure small electric currents the flow of charge through the meter makes the meter middle move.

Atoms contain negatively charged particles: electrons

Positively charged particles: protons