Static And Current Electricity

Question 1

Static Electricity

Answer 1

A build up of le trip charge that can occur on good insulators e.g. polythene and Perspex rods.

Question 2

Polythene rod

Answer 2

Gains electrons if a woollen cloth is rubbed on it ( becomes negatively charged).

Question 3

Perspex Rod

Answer 3

Loses electrons if it’s rubbed by a woollen cloth ( becomes positively charged).

Question 4

What is an electric current?

Answer 4

An electric current is caused by the flow of electrons through a good conductor such as metal.

Question 5

Closed circuits

Answer 5

A closed circuit is needed for the current to flow.

Question 6

Batteries

Answer 6

Energy provided by a battery or power pack is needed to move the current around the circuit.

Question 7

Potential difference

Answer 7

The difference in electrical pressure between the positive and negative ends.

Question 8

Resistance

Answer 8

The opposition to the flow of electrons. The unit is the Ohm and it is measured using an Ohmmeter.

Question 9

Ohm’s Law

Answer 9

Oh’ms law states that voltage is directly proportional to current .

Question 10

Direct current

Answer 10

Direct current goes in one direction only.

Question 11

Alternating Current

Answer 11

Changes very quickly many times a second.