What a shocker!
What is the correct unit for current?
A circuit that has more than one path for electrical current to flow through is called what?
a parallel circuit
If you rub a balloon on a sweater, the balloon takes many of the electrons. What is the overall charge of the sweater?
positive
Think of a bar magnet. Where is the magnetic field the strongest?
At the poles of the magnet.
What happens if you put the north end of one magnet near the north end of another magnet?
They magnets will repel each other
Describe the direction of electron flow in a circuit.
Electrons flow from negative to positive.
Give an example of a material that would be a good conductor of electrons.
metal
What happens to the current in a circuit if a 6 volt batter is removed and replaced by a 3 volt battery?
Current decreases
The south end of one magnet is attracted to the ___________ end of another magnet.
north
What device converts electrical energy into mechanical energy?
A motor
Series circuit
What is the voltage across a 200 ohm circuit element that draws a current of 3 amps?
600 volts
What object is designed to open and close a circuit easily?
a switch
As two magnets get further apart, what happens to their magnetic attraction?
It weakens because the magnetic force weakens.
Describe the energy transformation of a generator. (What type of energy does it start with, and what type of energy does it give out?)
Mechanical energy --> Electric energy
What happens to current if a 100 ohm resistor is replaced by a 50 ohm resistor?
current increases
A light bulb in a circuit represents an addition of what variable in ohm's law?
Resistance source
What happens if one bulb burns out in a set of lights on a series circuit?
All the lights go out
List two ways that you can cause a temporary magnet to lost its electromagnetism.
How can iron become a magnet?
Electrons spin in the same direction
Name two things that affect resistance in a circuit.
temperature, length of wires, thickness of wires
Most electrical wires are covered with plastic or rubber. What?
Plastic and rubber are good insulators
What is the difference between AC and DC current. (You may draw the difference.)
AC (alternating current) switches direction frequently. DC (direct current) always flows in one direction
Imagine this: you wrap a metal nail with copper wire, and then connect both ends of the wire to a battery. What will happen if you touch a metal paperclip to the nail?
The paperclip will stick to the nail because of magnetism
Congratulations!