Electromagnetic Induction
A student attaches a meter to a wire coil. Next, the student moves a magnet back and forth through the coil. As the magnet moves back and forth, the meter indicates what?
Current
A student wants to make an electromagnet. Which items are needed?
copper wire, metal nail, battery
Definition?
A device that converts mechanical energy into electrical energy
Definition?
A device that converts electrical energy into mechanical energy
How many poles does a bar magnet have?
2
When a magnet spins within a coil of wire, what is produced?
An electric current
Renaldo and Nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Renaldo and Nasreen do to increase the number of paper clips their electromagnet picks up?
Add more coils
In an electric generator, _______ will increase the output of electricity.
1. more coils
2. stronger magnet
What items can be arranged to transform electrical energy into mechanical energy?
battery, wire, iron
What is found around a bar magnet?
Magnetic field
Turning a magnet very quickly would be BEST used to create?
An electric current
Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. What material would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?
Iron
What does a generator produce?
Electricity
Describe how an electric motor works
Electricity creates a magnet that causes other parts of the motor to move.
Are people considered motors or generators?
Motors
When an electric current flows through a wire what is created?
A magnetic field
What will happen if you increase the electric current that is flowing through an electromagnet?
It will become stronger.
What kind of energy transformation takes place in a generator?
mechanical to electrical
In Physics lab, Ellen has been given the task of constructing a simple motor. She must find common household items at home and bring them to class the following day. Her list of items include:
9 volt battery and leads, copper wire rotor, platform to hold the rotor, a magnet, and a wood base
She sets up her motor in physics lab the next day and finds that it works well. Explain the flow of energy through Ellen's motor?
battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy
Name 3 ways electromagnets are unique.
1. can be turned on and off
2. can be made stronger
3. polarity can be reversed
Draw the process for creating an electric current with a magnet.
Teacher Discuss
Draw and label the correct way to put together an electromagnet.
Teacher Discuss
Where do we find most of the generators that produce our power?
TVA Dams
Name 5 objects that use motors.
Answers will vary
There are several key forms of clean energy that have been in use for over 70 years. Hydroelectric power is one of them.
Explain how hydroelectric power plants produce electricity in terms of magnets.
Water is used to turn turbines connected to these magnets. The magnets are turned inside large coils of wire.