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The Strength of an electromagnet is proportional to its
Ampreturns
a lightening protection device
lightening rod or arrestor
ohms law to find resistance if you know the amps and volts
R=E/I
this word means not moving or sitting still
staic
is the unit of resistance to current flow
Ohm
is the amount of potential necessary to cause 1 coulomb to produce 1 joule of work
Volt
what is another term similar in meaning to resistance
Impedance
Smallest part of an element
Atom
massless particle of pure energy
Photon
Materials containing seven or eight valence electrons
Insulators
An early instrument that be used to determine the polarity of the electric charge of an object is
Electroscope
in this circuit the current is directly proportional to the voltage and inversely proportional to the resistance
DC circuit
this law states it takes 1 volt to push 1 ampere through 1 ohm
Ohms Law
A foot-pound is the amount of force required to raise 1-pound weight 1 foot. The rate of doing work is the definations of this
Horsepower (hp)
the ohm is named after what German scientist
Georg S. Ohm
the amount of magnetism left in a material after the magnetizing force has stopped is called...
Residual Magnetism
Another common term for magnetic measurement. (Resistance to magnetism)
Reluctance
is a measure of a materials ability to become magnetized
Permeability
This magnet depends on electric current to flow to produce a magnetic field
Electromagnet
a Magnets ..... ...... repel each other and never cross
Lines of Flux
what are the two principle functions of a resistor
limit the flow of current and voltage divider
How is the value of a resistor often determined by
Color Code
Pot is a short form of what electrical term
Potentiometer
A resistor whose values can be changed or varied over a range
Variable Resistor
how many ohmic values does a fixed resistor have
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