The flow of electrons though a conductor
Drift of free electrons from on atom to the next
Drift Velocity- Few mm per second
I- electric current
I=C/s = Ampere (A)
Conventional Current Vs. Electric Flow
Benjamin Franklin – Conventional
Pos- More than normal amount of electricity
Neg- Less than normal amount of electricity
Electric Current- the rate of the amount of electrically charged particles
Electron Flow
Charge Carries
Electricity flows from + to –
Circuit- path of electricity
Resistance in Circuits
Resistance in the opposite of current flow
electric current looses energy as it flows through a resistor
energy is lost in the form of heat or light
V- volt meter- parallel
A- ammeter- series
Ohm’s Law
resistance is the same over a wide range of potential differences
R=V/I =Ohm (Ω)
Factors affect resistance
Ohmic- Same resistance regardless of potential difference
Lengths
Cross sectional aria
Temperature
Material
Colored Bands on resistors
Four bands
1st number
2nd number
To what power
Silver or gold
a. Silver +/- 10%
b. Gold +/- 5%
Power in circuits