The part of a loudspeaker that vibrates to create sound
What is the diaphragm
100
A device that uses a magnet to convert sound into electrical signals (think voice)
What is a microphone
100
What does a generator need to make electricity?
What is motion or mechanical energy
200
An instrument that uses Earth's magnetic field to find directions
What is a compass
200
Most of Earth is made up of this
What is melted iron
200
It changes electrical energy into mechanical energy
What is a motor
200
A device that turns electrical energy into sound
What is a loud speaker
200
In what ways is Earth like a magnet? a.) Earth's curst moves on plates causing earthquakes; b.) Earth has a north and a south pole, c.) Charged particles from Sun hit Earth, d.) Earth is divided into hemispheres.
What is b.) Earth has a north and a south pole?
300
The parts of a magnet where the magnetic force is the strongest
What are the poles
300
The names of Earth's two poles
What are the North and South poles
300
An electrical current that flows in one direction and then flows in the opposite direction
What is alternating current
300
True or False, a microphone is a device that uses a magnet to convert sound into electrical energy
What is TRUE
300
Provides the mechanical energy for a generator
What is a turbine
400
An example of a permanent magnet (a rock)
What is magnetite
400
Which of the following is needed to make an electromagnet? a.) electric current, b.) permanent magnet, c.) wood, d.) compass?
What is electric current?
400
The electrical flow is always in one direction
What is direct current
400
Which of the following materials would be best for the needle of a compass? a.) gold b.) silver c.) iron d.) copper
What is c.) iron?
400
An electric generator changes the energy of - a.) motion into electrical energy, b.) magnetism into heat, c.) electric energy into motion, d.) light into electricity.
What is motion into electric energy?
500
Which of the following do electric generators and electric motors have in common? a.) magnets, b.) hydroelectricity, c.) fan, d.) turbine.
What is a.) magnets?
500
A coil of wire wrapped around an iron bar
What is an electromagnet
500
Turn motion into electrical energy
What is a generator
500
What direction does a compass point?
What is north?
500
The part of a door bell that bangs against the bell