Physics Mains Electricity

What is the name of the pin labelled 2 in the diagram?

• Earth

• Neutral

• Live

What colour is the Earth wire in a plug?

• Red

• Red and black

• Green

• Green and yellow

Which is the live wire in the diagram?

• Number 2

• Number 3

• Number 4

• Number 5

What is the potential difference of the mains electricity supply? _________ volts

What is the frequency of the mains electricity supply? (do not worry about the units here)

What is the unit of frequency?

Tags

NGSS.HS-PS4-1

What does the graph on the left show?

• direct current

• alternating current

Which diagram shows an oscilloscope trace of alternating current?

• left hand diagram

• right hand diagram

Tags

NGSS.HS-PS4-5

Imagine the diagrams are numbered 1,2,3,4 from left to right.

Which is the symbol for a fuse?

• 1

• 2

• 3

• 4

Imagine the symbols are numbered 1,2,3,4 from left to right.

What is number 3 the symbol for?

• A variable resistor

• A fuse

• A lamp

• A fixed resistor