Week 2 - Resistance, Magnets and Electromagnets

How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

What is this?

• magnet
• electromagnet
• series circuit
• parallel circuit

How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

A coil that is magnetized only when an electric current flows through it is _____________.

• a battery
• a generator
• a conductor
• an electromagnet

Surrounding every magnet is a __________  __________.

• magnetic field
• electrical current
• another magnet
• an enemy

What are the differences between an Electromagnet and a Permanent Magnet? Choose more than one!

• A permanent magnet stays a magnet forever and a Electromagnet doesn't.

• An Electromagnet need electricity and a permanent magnet doesn't

• Electromagnets are less useful.

• You can on and off an electromagnet bit not a permanent magnet

• You can change the power of the permanent magnet but not an electromagnet.

How does resistance affect current?

• less resistance - less current
• more resistance - less current
• more resistance - more current
• resistance does not affect current

What effect do electrons flowing through a resistor have on the resistor.

• make it glow

• reduce it's resistance

• increase it's resistance

• heat it up

What is the unit of resistance

• Ohm

• Home

• Amp

• Camp

As the length of a wire increases, the resistance of the wire will

• increase

• decrease

• stay the same