Magnets
Current Electricity
Electromagnets
Static electricity
Challenges
100
Magnets always have this many poles, no matter the shape
2 (North & South)
100
The subatomic particle that moves and is responsible for electrical energy is the ______________________
Electron
100
What 3 parts are necessary for an electromagnet?
Iron core
solenoid
Power source
100
The electric charge of an ordinary balloon is ________
Neutral! Everything trends neutral unless acted upon
100
Semiconductors are made out of which element is most electronics
Silicon
200
A North Pole does what to another North Pole of a magnet?
Repel (Push)
200
The type of circuit in this image is
A. Parallel
B. Series
C. Neither
Parallel! There is more than one path for electricity to flow
200
What transformation of energy occurs in a motor?
________ energy -> __________ energy
Electrical -> Mechanical
200
If you charge an object via conduction, what is it that you must do?
Touch the materials together
200
A working L.E.D. light in a circuit is picked up, turned backwards, and placed back into the circuit. Does it turn on?
NO! LED= Light emitting diode
Electricity in a diode only flows in one direction
300
Name 3 devices that have magnets in them
Many answers:
Motors, generators, speakers, Cranes, etc.
300
The circuit in this image has 2 bulbs. If one bulb is removed, what happens to the other bulb?
It goes out! In Series, all the devices are on or off together.
300
Select all that apply:
To strengthen an electromagnet you can
-up the resistance of the circuit
-add more loops of wire to the solenoid
- increase the current
- use a smaller iron core
-add more loops of wire to the solenoid
- increase the current
300
In which of the following scenarios will clothes in the dryer stick together?
A When a shirt gains electrons and a second shirt gains electrons
B When a sock gains electrons and a shirt has lost electrons
C When a sock has gained protons and a hat has lost protons
D When 2 pairs of shorts both lose electrons
B When a sock gains electrons and a shirt has lost electrons
300
What is electrical resistance?
how much a material opposes the flow of electricity
400
True or false:
Magnetic fields look like this, and stop at the poles
False! The magnetic field runs through the magnet too.
400
Using an open circuit, how can you test if a material like a spaghetti noodle is a conductor or insulator?
Place it in the open circuit and see if the circuit allows electricity to flow.
400
A benefit of an electromagnet over a permanent magnet is ________________________
They can be turned on or off
They can be made stronger or weaker when needed
400
This word means-
When the static electricity built up on an object then suddenly returns to neutral by allowing charges to move
Discharge
400
Which of these is a resistor?
-Battery
-lightbulb
-wires
-iron core
Lightbulb! Any device that absorbs power from the circuit is a resistor, with some of them having a purpose of adding electrical resistance to slow current in a circuit, like the one in the image
500
Which pole of a magnet is stronger, North or South?
Trick Question! They are both equally strong
500
In a circuit, a device that can control the flow of current or even stop it is called a ___________
transistor
500
A disadvantage of an electromagnet over a permanent magnet includes _______________________
Strong ones are expensive
A constant power supply is needed or it goes off
500
When a neutral object like this wall has its electrons pushed/pulled to one side of the object this is called _____________
Polarization
500
If you charge something wirelessly, how does the extra electrical energy enter your battery if no wire gets connected?
Electromagnets! A current turns on and creates a magnetic field in the charging pad, which creates electricity inside your phone's inner coil to charge your battery