Electricty

Question 1

Static electricity

Answer 1

Is a build up of electric charge that can occur on good insulators e.g polythene and Perspex rods

Question 2

Polythene rod

Answer 2

A polythene rod gains electrons if a wooden cloth is rubbed on it (becomes negatively charged)

Question 3

A perspex rod

Answer 3

A Perspex rod loses electrons if it is rubbed by a wooden cloth (becomes positively charged)

Question 4

Electric current

Answer 4

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

Question 5

A good insulator

Answer 5

A good insulator does not allow the electric current to flow

Question 6

Closed circuit

Answer 6

A closed circuit is needed for the current to flow.

Question 7

If there is a break in a circuit

Answer 7

If there is a break In a circuit then the current won’t flow and the electrical energy can’t get through

Question 8

Battery

Answer 8

The battery pumps electrons from its negative and around a circuit. The electrons travel all the way around are attracted back to the positive end of the battery

Question 9

Potential difference

Answer 9

The difference in electrical pressure between the positive and negative ends of battery/powerpack is called the potential difference

Question 10

Resistance

Answer 10

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

Question 11

Resistor

Answer 11

If a resistor is placed in an electric circuit, it will slow down the flow of electrons

Question 12

Ohms law

Answer 12

Ohms law states that voltage is directly proportional to current