Science Unit 5.3 to 5.9

Question 1

What is Brass?

Answer 1

It is a mixture of copper and tin.

Question 2

What is Iron?

Answer 2

It is a mixture of nickel and chromium.

Question 3

What is the unit of measuring current?

Answer 3

It is amperes or amps for short.

Question 4

What is the instrument used to measure current?

Answer 4

It is a multimeter.

Question 5

What does the multimeter have? Remember chapter 5.3

Answer 5

The multimeter has connectors.

Question 6

What is metal used for?

Answer 6

It is used for the metal pins in a plug.

Question 7

What are the two main things electrical appliances made of?

Answer 7

They are made of conductors and insulators.

Question 8

What is electricity?

Answer 8

Electricity is a form of energy. Electricity is caused by the flow of electrons present in an atom.

Question 9

Name some sources of electricity

Answer 9

Cells
Battery
Plug

Question 10

What is a series circuit?

Answer 10

It is a circuit in which there is only one path for electricity to flow.

Question 11

Instead of drawing a circuit that uses a lot of time, what can we do instead?

Answer 11

We can use circuit symbols which takes less time and is understood by all people who know them.

Question 12

What does removing or adding bulbs to a circuit do?

Answer 12

It causes each of them to glow less brightly or more brightly.

Question 13

What does removing or adding batteries or cells to a circuit do?

Answer 13

It also causes the bulbs to glow less brightly or more brightly.

Question 14

What unit is used to measure the strength of electricity?

Answer 14

The unit used is volts or also V for short.

Question 15

How does the thickness of the wire affect the speed it is traveling?

Answer 15

It will change as more electricity will pass through the thick wire while less will flow in the wire that is thin.

Question 16

What do you need for a 3v buzzer?

Answer 16

You need a 3v battery or power source.

Question 17

When and where did the workers find the ancient tomb?

Answer 17

They found it in June 1936 near Baghdad.

Question 18

What was one of the oldest items they found inside the tomb? (Remember chapter number 5.9)

Answer 18

The oldest item that was found was a clay jar.

Question 19

Describe the jar briefly

Answer 19

The jar had an iron rod coming out from the center, surrounded by a tube made out of copper. It was known as the Baghdad battery

Question 20

Who was Luigi Galvani? What did he do?

Answer 20

He was an Italian doctor and at about 1780 he discovered current electricity.

Question 21

Who was Alessandro Volta?

Answer 21

He was an Italian university professor.

Question 22

What are the three things needed for a circuit?

Answer 22

They are:
The source
The wires
And an unbroken loop.

Question 23

What is a switch?

Answer 23

A switch is a device used for making and breaking electric current through the circuit.

Question 24

What should we check if a circuit is not working?

Answer 24

We should check if the
Wires are not broken
Wires are connected 
Switch is open
Or if the battery has leaked or is dead.

Question 25

What is current?

Answer 25

Current is the rate at which electric charges flow.

Question 26

How do we measure current?

Answer 26

We measure current by the number of charges that flow through a point in a circuit in one second.

Question 27

Random Learning Point

It’s not a question it’s just something you can learn if you don’t know

Answer 27

All metals conduct electricity but some metals conduct better than others.

Question 28

How is the strength of electricity measured?

Full Answer

Answer 28

It is measured using the unit Volts or V for short. It was named after the Italian Professor Alessandro Volta. And you can clearly notice the word VOLT in his second name, which was Volta.