Checklist (on booklet)

Question 1

What are the properties of conductors and give an example?

Answer 1

In a conductor, electrical charge carriers, usually electrons or ions, move easily from atom to atom when voltage is applied. E.g. Silver, aluminium, copper

Question 2

What are the properties of insulators and give an example?

Answer 2

They do not let electrons flow very easily from one atom to another. E.g. Wood, rubber, glass

Question 3

What is a series circuit?

Answer 3

A series circuit is a circuit which the current runs through all components one after the other like in a line. If a bulb breaks in this circuit everything else would as the line of electrcity would be blocked.

Question 4

What is a parallel circuit?

Answer 4

A parallel circuit is a circuit which could have seperate branching wires and connecting again. A bulb could break in this circuit and it would still work as there are other established lines of travel for electricity.

Question 5

What is current?

Answer 5

Current is the rate at which electrons flow past a point in a complete electrical circuit. (I)

Question 6

What is voltage?

Answer 6

Voltage is the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop (V)

Question 7

What is resistance?

Answer 7

Resistance is a measure of the opposition to current flow in an electrical circuit. (Ω)

Question 8

What is Ohm’s Law in mathamatical terms and in description?

Answer 8

V/I = R, electric current is proportional to voltage and inversely proportional to resistance.

Question 9

What are the properties of ohmic resistors?

Answer 9

An ohmic resistor is a resistor that obeys Ohm’s law V = IR (voltage = current x resistance).

Question 10

What are the properties of non-ohmic resistors?

Answer 10

Such devices do not have a constant value of resistance and the resistance is called dynamic resistance because it is constantly changing.

Question 11

What are the causes of non-ohmic behaviour?

Answer 11

Resistors without an adequate heat sink are nonohmic because the temperature of the conducting material changes with temperature.

Question 12

What are permanent magnets?

Answer 12

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field.

Question 13

What are temporary magnets?

Answer 13

Temporary magnets are those that simply act like permanent magnets when they are within a strong magnetic field

Question 14

List some objects attracted to magnets?

Answer 14

Paper clips, scissors, screws, nuts, and bolts

Question 15

What is the behaviour of the like and unlike magnetic poles

Answer 15

When you have more than one magnet, like (or same) poles repel, or push, each other. Opposite poles attract, or pull, each other.

Question 16

How are magnetic field produced?

Answer 16

As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion

Question 17

Describe the magnetic field around magnets

Answer 17

A magnetic field is the area around a magnet, magnetic object, or an electric charge in which magnetic force is exerted.

Question 18

What is a electromagnet?

Answer 18

a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.