# Electricity

### 23 terms by emily126

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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)

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+...

P=IV

E=PT

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

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