Electricity

Question 1

What is electricity?

Answer 1

A form of energy that can easily change to other forms such as heat and light.

Question 2

What is electricity flowing through a wire called?

Answer 2

Current.

Question 3

What consists of a stream of particles called electrons?

Answer 3

Current.

Question 4

Why is electricity dangerous?

Answer 4

It always tries to find the easiest path to the ground.

Question 5

What percentage of the human body is water?

Answer 5

70%.

Question 6

What can cause an electric shock?

Answer 6

Electricity passing through water in the body.

Question 7

What is defined as electricity more than 1000 volts?

Answer 7

High voltage electricity.

Question 8

What is the mains voltage in the UK?

Answer 8

240 volts.

Question 9

What is the proper term for a battery?

Answer 9

Cell.

Question 10

How much voltage does a standard cell supply?

Answer 10

1.5 V.

Question 11

What is the National Grid’s electricity supply usually between?

Answer 11

275,000 and 400,000 V.

Question 12

What is a common warning sign near high voltage electricity?

Answer 12

‘Danger of Death.’

Question 13

What can electric shocks cause?

Answer 13

• Heart to stop beating
• Breathing difficulties
• Muscle contraction
• Shock
• Burns

Question 14

What should you never do with your fingers in an electrical socket?

Answer 14

Put anything other than a properly wired plug.

Question 15

What role does the earth wire play in a plug?

Answer 15

Provides an easy route for electricity to flow in case of a fault.

Question 16

What is the longest pin in a plug?

Answer 16

Earth pin.

Question 17

What is the purpose of a fuse in a plug?

Answer 17

To break the circuit if too much electricity flows.

Question 18

What are the components of an electrical circuit? (Name at least three)

Answer 18

• Cell
• Bulb
• Ammeter
• Voltmeter
• Resistor

Question 19

What materials are good conductors?

Answer 19

• Copper
• Silver
• Aluminium
• Gold
• Graphite

Question 20

What materials are considered insulators?

Answer 20

• Plastic
• Rubber
• Wood
• Glass
• Ceramic

Question 21

What is a series circuit?

Answer 21

A type of circuit where there is only one path for the current to travel.

Question 22

What happens to brightness in a series circuit when you change the number of cells?

Answer 22

If the number of cells equals the number of bulbs, brightness is normal.

Question 23

How is current measured in a series circuit?

Answer 23

Using an ammeter.

Question 24

What is voltage?

Answer 24

A measure of the difference in electrical energy between two parts.

Question 25

How is voltage measured?

Answer 25

Using a voltmeter.

Question 26

What happens to the voltage in a series circuit with multiple bulbs?

Answer 26

The voltage is split across the bulbs.

Question 27

What is a parallel circuit?

Answer 27

A circuit where there is more than one possible path for the current.

Question 28

How does current behave in a parallel circuit?

Answer 28

The current is split across the different paths.

Question 29

What is resistance?

Answer 29

The opposition to the flow of electrical current.

Question 30

Who is credited with discovering the relationship between voltage, current, and resistance?

Answer 30

Georg Ohm.

Question 31

What is Ohm's law?

Answer 31

Voltage (V) = Current (A) × Resistance (Ω).

Question 32

Fill in the blank: The unit of measuring resistance is called the _______.

Answer 32

Ohm.