Lesson 1: How do Electric Charges Flow in a Circuit?
Brass, Gold, Silver, Aluminum...
The resistor in an incandescent light bulb is called a...
Filament
Name two objects that are attracted to magnets.
What is one way to increase the strength of an electromagnet?
- Coil the wire around an iron core.
- Add more coils of wire.
- Attach a stronger battery.
A _____________is a material through which an electric charge can move easily.
Conductor
What is one use for an insulator?
(Possible Answer) It makes electrically charged objects safe to handle.
True or False: Energy is never created or destroyed.
TRUE
What poles of a magnet would repel each other?
South/South or North/North
How is an electromagnet different from a refrigerator magnet?
A refrigerator magnet still works if you do not provide an electric current, but an electromagnet does not.
A ______________ circuit has 2 or more paths in which electric charges may flow.
Parallel
What would happen in a series circuit if an eraser was added to the circuit?
The electric current would no longer be able to flow.
What happens when energy is transformed by a wind turbine?
___________ energy changes to _________ energy.
Wind energy changes to electrical energy.
Do all magnetic fields have the same shape? Why or why not.
No - because the shape of the magnetic field depends on the shape of the magnet.
What are two characteristics of an electromagnet that make them useful?
- They can be turned on and off.
- You can vary the strength of an electromagnet.
____________ is a force that acts on moving electric charges and magnetic materials.
Magnetism
What item must be included in a circuit for an electric current to flow?
A. Battery
B. Resistor
C. Light Bulb
D. Switch
A. Battery
True or False: A violin transforms electrical energy into sound energy.
FALSE
A violin does not use electrical energy.
What types of metal are magnetic? (name 2)
Nickel, Cobalt, Iron...
True or False: Generators transform solar energy into electrical energy.
FALSE
A solar panel transforms solar energy into electrical energy.
An _________________ is a magnet that only works when electricity is provided.
Electromagnet
If the switch is turned on, then electric current will be able to flow through the circuit. If the switch is turned off, the current will not be able to flow.
How is electrical energy transformed in a clothes dryer?
Electrical energy is transformed into thermal energy, which heats the clothes. Electrical energy is also transformed into kinetic energy, since the dryer moves in a circular motion to help dry the clothing.
Why does one end of a compass needle point north?
The compass needle is a magnet and responds to Earth's magnetic field. It points toward Earth's magnetic north pole.
What was Oersted's important scientific discovery?
Oersted discovered that electricity and magnetism are related.
A ______________ is a machine that produces electric energy by turning coils of wire around powerful magnets.
Generator