When an object becomes charged, charge is neither created nor____.
Destroyed
100
Do LIKE poles attract or repel?
A. Repel
B. Attract
C. none of the above
A. Repel
100
Tell what each letter in this equation stands for and what unit it is measured in:
I=V/R
Current (amperes)= Voltage different (volts)/ Resistance (ohm's)
100
-Accumulation of excess electric charge on an object.
Static Electricity
100
-exerts a force on other magnets and objects made of magnetic material. A magnet is surrounded by this.
Magnetic Field
200
____ is measured in amperes.
current
200
A car battery is an example of what kind of cell?
A. Wet Cell
B. Dry Cell
C. None of the above
A. Wet Cell
200
If your Voltage Difference is 120 V and your current is 0.5 A then what is your resistance?
60 ohm's
200
-A material in which electrons are able to move easily.
Conductor
200
-Temporary magnet made by wrapping a wire coil carrying a current around an iron core.
Electromagnet
300
Households are usually wired with _____ circuits. Why?
Parallel. Becuase in a series circuit the current has only one loop to flow through. In this case, if one light went out, they all would.
300
You can increase the strength of an electromagnet by what?
A. Reducing the Current
B. Adding loops to the coil
C. Neither
B. Adding loops to the coil
300
Tell what each letter in this equation stands for and what unit it is measured in:
P=IV
Electric power (watts)= current (amperes) X Voltage Difference (volts)
300
-Related to the force that causes electric charges to flow.
Voltage Difference
300
-Device that uses an electomagnet to measure electric current.
Galvanometer
400
____ are used in all types of industry, agriculture, and transportation, including airplanes and automoblies.
Electric Motor.
400
Where is the magnetic forces strongest?
A. magnetic domains
B. magnetic field
C. magnetic poles
D. electromagnetic
C. Magnetic poles
400
A toaster oven is plugged into an outlet where the voltage difference is 120 V. How much power does the toaster oven use if the current in the oven is 10 A.
1200 watts
400
-States that the current in a circuit equals the voltage difference divided by the resistance.
Ohm's Law
400
-A large wheel that rotates when pushes by water, wind, or steam.
Turbine
500
Working independently in 1831, Michael ______ in Britain and Joseph ______ in the United States both found that moving a loop of wire through a magnetic field caused an electric current to flow in the wire.
Faraday & Henry
500
A circuit breaker contains a piece of metal that does what when it gets hot?
Bends
500
Tell what each letter in this equation stands for and what unit it is measured in:
E=Pt
Electrical Energy (kWh)= electric power (kW) X time (hours)
500
-Rate at which electrical energy is converted to another form of energy.
Electric power
500
-Generation of a current by changing magnetic field.