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23 terms

Electricity

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Current:define,unit,equation
the flow of electrons
unit: amp
I=V/R
Coulomb
#of electrons per second: 6.25 x 10^8
Potential Difference:aka, definition, units, equation
aka:Voltage
Definition:electrical pressure
unit: volt
equation: V=IR
Resistance: definition, unit, equation
inhibits or impedes electron flow
unit: ohm
R=V/I
Open Circuit
when the switch is off, no place for electrons to go, electron transportation is incomplete
Closed Circuit
switch is on, switch connects the ends of open circuit, electrons allowed to flow
direct current
electrons flow in ONE direction, ex: battery
alternating current
electrons have reverse direction, EX: anything plugged in
things that affect resistance of wire
Length(L direct prop to R)
Thickness(R indirect prop to diameter^2)
Composition-exof good:gold, ex bad:nichrome
Temp(T direct to R)
Rheostat
dimmer switch
Ohms law
V direct Prop to I, I indirect to R
Series circuit: problems, relation with volts and currents, use, equation
Problems: if 1 goes out-all go out, all appliances must be on 24/7, appliances wont work without proper voltage
relations: volts are shared, current is the same in each resistor
use: blinking lights
equation:RT=R1+R2+etc
Parallel Circuits: reasons to us, relations with volts and currents, equation
Reasons: if 1 goes out-rest are on, dont have to be on 24/7, each appliance gets same voltage
Relations: currents are shared, volts are the same
Equation: 1/RT=1/R1+1/R2+...
Power equation
P=IV
Energy equation
E=PT
Final Cost equation
FC=E(cost/hour)
Heat equations
Q=R(I^2)(Time)
Q=Power(time)
Q=(m)(c)(change in temp)
electronic signals
Info sent as patterns in the controlled flow of electrons thru a circuit
vacuum tube
change alt current to direct current, increase signal strenght, turn currents on or off
semiconductors
conduct currents only under certain conditions
Diodes
combine n-type and p-type
transistors
3 layers used as a switch
integrated circuit
thin slice of silicon that contain solid state components