Electricity

Question 1

What is electrical current?

Answer 1

The flow of electrons

Question 2

What do you use to measure current?

Answer 2

Ammeter

Question 3

What units do you use for current?

Answer 3

Amps

Question 4

What is voltage?

Answer 4

The force that pushes electrons through a circuit

Question 5

What do you use to measure voltage?

Answer 5

Voltmeter

Question 6

What units do you use to measure voltage?

Answer 6

Volts

Question 7

What is potential difference?

Answer 7

The measure of energy transferred between two points in a circuit

Question 8

What is resistance?

Answer 8

The opposition of electrical current in a circuit

Question 9

What is resistance measured in?

Answer 9

Ohms

Question 10

What formula can we use to measure resistance?

Answer 10

R= V/I

Question 11

What is the relative charge on a proton?

Answer 11

Positive

Question 12

What is the relative charge on a electron?

Answer 12

Negative

Question 13

Does a neutron have a positive or negative charge?

Answer 13

None- it doesn’t have an overall charge

Question 14

What is an atom?

Answer 14

The smallest part of a substance that can not be broken down chemically

Question 15

What is the centre of an atom called?

Answer 15

The nucleus

Question 16

What is the overall charge of the nucleus?

Answer 16

Positive- the neutrons do not have any charge and the protons are positive making the nucleus it as well

Question 17

What happens if two protons or electrons get close to each other?

Answer 17

They repel

Question 18

What happens if an electron and proton get close to each other?

Answer 18

They attract

Question 19

Why when I spray paint a car does it stick to it?

Answer 19

As opposites attract- the spray paint is positively charged while the car is negatively charged causing an even spray

Question 20

What is a conductor?

Answer 20

A material or substance that allows electricity to flow through it

Question 21

What is an insulator?

Answer 21

A material or substance that does not allow electricity to pass through it

Question 22

Give an example of a conductor

Answer 22

Metals like iron and copper

Question 23

What non-metal is a conductor

Answer 23

Graphite

Question 24

Give an example of an insulator

Answer 24

Wood or glass

Question 25

What must a series circuit include?

Answer 25

All components connected in one loop so that there is only one route in which the electrons can flow through

Question 26

What must remain the same in a series circuit?

Answer 26

The current

Question 27

What is shared in a series circuit?

Answer 27

The potential difference

Question 28

If I had a circuit with two bulbs and a total current of 6A, what would the potential difference be for each bulb?

Answer 28

3A

Question 29

What is an electromagnet?

Answer 29

A magnet that is created by passing electrical current through a coil wire, often around a soft iron core which increases the strength.

Question 30

What 3 things can you do to increase the strength of an electromagnet?

Answer 30

You can increase the voltage, add an iron core which increases the strength because of its high magnetism and add more coils to the wire.

Question 31

What is static electricity?

Answer 31

It is when two insulators rub against each other causing electrons to move from one object to another.

Question 32

How does static electricity work?

Answer 32

When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other.

Question 33

Lily realises that when she combs her hair, her comb sticks to it. Explain why this happens. Hint- It is to do with static electricity

Answer 33

Things to include in your answer: - Comb & hair are insulators - The comb rubs against her hair- electrons move leaving the charges similar - Opposite charges attract so it sticks

Question 34

What is a fuse?

Answer 34

A fuse is a safety device in electrical circuits that protects against overcurrents by melting and breaking the circuit when excessive current flows, preventing potential damage or fires.

Question 35

Sam has a circuit with a bulb which has a rating of 3A and 3 cells each with a rating of 1.5 A. Explain why when Sam opens the switch, the circuit would blow up.

Answer 35

Things to include in your answer: - Bulb ratings tell you how much current can safely pass through - 3 cells- 1.5 x 3=4.5 - Current is too high for the bulb as it has a rating of 3A meaning the circuit would blow up.