Introduction to electricity

Electricity is

• The movement of electrons

• The movement of protons

• The movement of neutrons

• A form of energy that travels in straight lines

The three subatomic particles of an atom and their charges are

• Protons (+), neutrons (+), electrons (+)

• Protons (-), neutrons (-), electrons (-)

• Protons (+), neutrons (no charge), electrons (-)

• Protons (-), neutrons (+), electrons (no charge)

In a neutral atom, the number of ________ equals the number of ________

• Protons, neutrons

• Neutrons, electrons

• Electrons, electric current

• Protons, electrons

Opposite charges ___________ and like charges ____________

• Repel, attract

• Attract, repel

• Attract, lose their static electricity

• Lose their electrical current, repel

In the electrical circuit above the bulb will turn on if the wires are connected to each terminal. What happens when one wire is disconnected?

• The bulb will still be lit

• The electrons will still be able to travel through the wire and provide electricity to the power pack

• The bulb will blow out and not be able to be switched on again

• The bulb will switch off

Electrical current is

• The movement of electrons from atom to atom which are constantly being replaced

• When the electric charges don't move in a wire

• A measure of how well a material can conduct electricity

• How difficult it is for electrons to move through an object

Electrons move out the negative terminal of a battery because

• Like charges attract- Electrons are + charged therefore they move through a wire to get to the + terminal

• Opposite charges attract- Electrons are - charged therefore they move through a wire to get to the + terminal

• A battery always has two negative terminals

• Electrons heat up too quickly if kept inside a battery

Electric current is measured in _________ using an _________

• Ohms, resistor

• Amps, power pack

• Amps, ammeter

• Volts, voltmeter

Why are wires plastic coated?

• To prevent resistance escaping a wire

• Because insulators are good conductors of heat

• Because the high resistance in tungsten causes the wire to become red hot

• To prevent electric current from escaping into other conductors and our body

1A=1000mA.

Therefore, 50,000mA=________A

• 0.5

• 5

• 50

• 500