Advertisement Upgrade to remove ads

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

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set