WJEC Physics 3.4

An oscilloscope shows the current flow above what type of current is it showing?

• DC

• AC

• Rectified Current

• Non rectified current

Tags

NGSS.HS-PS4-1

• DC

• AC

• rectified current

• non rectified current

Tags

NGSS.HS-PS2-5

What component protects the appliance from overloading which could start a fire?

• Earth Wire

• Neutral Wire

• live wire

• Fuse

• battery

What colour is the neutral wire in a three pin plug

• Red

• Blue

• Green and yellow

• white

• black

What is the function of the neutral wire?

• To carry a high voltage

• To complete circuit

• It is a safety wire

• protect the fuse

A plastic appliances like hairdryers are double insulated.

This means they do not need....

• A fuse

• An earth wire

• A neutral wire

• A live wire

• A switch

what happens to a 3A fuse when the current reaches 3 amps?

• it sets alight

• it melts

• it explodes

• it cracks

• nothing happens

what happens to a 15A fuse when the current reaches 3 amps?

• it sets alight

• it melts

• it explodes

• it cracks

• nothing happens

A(n) ______________ is a reusable safety switch that breaks the circuit when the current gets too high.

• Fuse
• Grounded wire
• Fuse box
• Circuit breaker

double insulated tools are the tools which:

• have two switches to turn on
• has no metal part
• all metal parts are insulated form the live wire
• has double wires and and ground wire