Year 8 Electricity

Question 1

What are the two types of charge?

Answer 1

Positive and negative

Question 2

In a parallel circuit, what is the voltage across each of the branches in relation to the voltage across the battery?

Answer 2

They are the same

Question 3

In a series circuit, what is the voltage across all of the branches in relation to the voltage across the battery?

Answer 3

The voltage across all of the branches adds up to the voltage across the battery

Question 4

What is the current like in a series circuit?

Answer 4

It is the same at every point on the circuit

Question 5

What is the current like in a parallel circuit?

Answer 5

The current in all of the branches adds up to the current by the battery

Question 6

Why do long wires have more resistance?

Answer 6

Electrons hit against more more metal ions, which makes them lose energy

Question 7

Why do thin wires have more resistance?

Answer 7

The electrons hit against the sides of the wire more, causing them to lose energy

Question 8

Who made the first battery?

Answer 8

Volta

Question 9

Why does a wire get hotter when a current passes through it?

Answer 9

The electrons bump into atoms on the wire, which transfers kinetic energy into heat energy

Question 10

What is Ohm’s law?

Answer 10

Voltage = current x resistance
Resistance = voltage ÷ current

Question 11

True or false: adding more resistors in parallel decreases the current in the circuit

Answer 11

False, it increases the current