Compasses
What are magnets attracted to?
Magnetic field lines that travel from North to South
North to South or South to North
Current is the flow of what type of particle?
Electrons
What do you use when you lose power?
A generator
The distance between crest to crest, trough to trough and equilibrium point to equilibrium point.
What is a compass? What does it do?
A device used to detect and measure magnetic fields and gives us direction.
What makes something magnetic? It starts with a D.
Electric current in a wire creates a magnetic field around the wire. Why does it not create an electric field?
A current of electricity always creates a magnetic field circling around it through an electromagnetic force. This is not an electric field.
A generator converts _________ energy to _______
energy.
Mechanical energy to electrical energy.
What is frequency?
The number of waves past a point in a second.
A compass in your hand is attracted to the?
Maintains its North and South orientation.
An electric current flows up, what direction does the magnetic field go?
Clockwise
A motor converts _________ energy to _________ energy.
How do you increase the strength of an electromagnet?
More current, more core and more coils
Where do the magnetic fields go inside the magnet?
South to North.
The magnet maintains its polarity, the North stays on the same side and the south stays on the same side.
An electric current flows down, what direction does the magnetic field go?
Counter-clockwise
Describe the two fields that interact in a motor.
They are both magnetic fields. One comes from a permanent magnet and the other comes from the electromagnet (red solenoid coil)
How do you measure the amplitude?
You go from equilibrium point to the crest or the trough.
They point in a circle because that is the direction of the magnetic field which forms around a current carrying wire.
What are the two types of magnets in an electromagnet (like the one we had in class)?
A permanent magnet (black) and an electromagnet.
what generates a current in a wire?
a moving magnetic field.
Draw and a label a diagram of an electric motor.
Answers vary
What is the frequency of a 10 m/s wave, with a wavelength of 5 m?
2 Hz