Electricity

Question 1

What are electrical currents measured in?

Answer 1

amps (ampere)

Question 2

What happens when you add more components?

Answer 2

Resistance increases

Question 3

What happens to the current when the resistance increases?

Answer 3

It decreases/gets weaker

Question 4

Current in a parallel circuit

Answer 4

A1=A2+A3

Question 5

Current in a series circuit

Answer 5

current is equal all the way around

Question 6

How many wires are there in a plug and what are they?

Answer 6

3
Live wire: brown
Neutral wire: blue
Earth wire: green and yellow

Question 7

Where is the Earth wire connected?

Answer 7

from the plug to the casing

Question 8

Where is the fuse?

Answer 8

On the live wire

Question 9

What happens when you are electrocuted?

Answer 9

Your muscles contract

Question 10

Are nerves good conductors of electricity?

Answer 10

Yes

Question 11

What is a fuse?

Answer 11

A thin wire that is designed to melt if the current gets too hot

Question 12

How can the fuse be adapted to withstand more current?

Answer 12

the thicker the wire, the more current it can withstand before it melts

Question 13

What does the earth wire do if the casing becomes live?

Answer 13

If the casing becomes live, the earth wire would redirect the electrical current down to the plug which would be the easiest/quickest route as it would take longer/be more difficult for the current to pass through a human.

Question 14

What direction does electricity flow?

Answer 14

From the plus to the minus side of the cell

Question 15

What is current?

Answer 15

Current is the flow of charge around a circuit. The moving charges are negative electrons. Current can only flow if the circuit is complete with no gaps.

Question 16

What happens to the current in a circuit?

Answer 16

The current isn’t used up as it flows through a circuit. The total current is always the same

Question 17

What happens if we use more batteries?

Answer 17

The current will be greater so the bulbs will be brighter.

Question 18

What happens if we use more bulbs?

Answer 18

The current will be weaker so the bulbs will be dimmer because the bulbs cause resistance due to their thin wire filament

Question 19

How big are charges and where are they?
What do the charges carry?
How fast do the charges move, relatively?
What is the electric current?`
Where do the charges deliver energy?
What does the battery do?
Where to the charges collect the energy?

What happens if the charges speed up?

Answer 19

• Charges are atom sized particles already in the wire.
• The charges carry energy
• All the charges move at the same speed
• The electric current is the number of charges passing a point at each second.
• The charges deliver energy to the bulb where it is transferred into heat and light
• The battery provides energy and makes the charges move.
• Charges collect energy at the battery
• Charges return to the battery to collect energy
• If the charges speed up, more energy is delivered to the bulb in a certain time
• If more energy is carried by each charge, more energy is delivered to the bulb in a certain time.

Question 20

What happens if a battery is the wrong way around?

Answer 20

If a battery is the wrong way around, it cancels out.

Question 21

Ammeter

Answer 21

A device used to measure electric current

Question 22

Ampere

Answer 22

Unit of current
e.g.
“The current in the bul is 4 amps or amperes (A)”

Question 23

Battery

Answer 23

A chemical supply of energy

Common battery voltage include 1.5 V and 9 V

Question 24

Cell

Answer 24

A store of internal energy that can be transferred as an electric current in a circuit

Question 25

Circuit

Answer 25

A closed loop through which current moves: from a power source, through a series of components, and back to the power source

Question 26

Circuit diagram

Answer 26

A diagram that represents an electric circuit using lines and symbols

Question 27

Circuit symbol

Answer 27

Symbol used to represent an electrical component in a circuit diagram

Question 28

Conductor

Answer 28

A material which allows charge to move easily through it

Question 29

Electric charge

Answer 29

The electrical state of an object, which can be positively or negatively charged.

Question 30

Electric current

Answer 30

The movement of electrically charged particles, for example, electron moving through wire or ions moving through a solution

Question 31

Electron

Answer 31

Subatomic particle, with a negative charge and a negligible mass relative to protons and neutrons

Question 32

In parallel

Answer 32

In a parallel circuit, the current divides into 2 or more paths before recombining to complete the circuit. Lamps and other components in these different paths are said to be in parallel. The paths are called branches.

Question 33

In series

Answer 33

Connected to a circuit in such a way way that the same current flows through each component in turn. Opposite of parallel

Question 34

Insulator

Answer 34

Material that does not allow charge or heat to pass through it easily

Question 35

Ohms

Answer 35

The unit of electrical resistance, whose symbol is Ω