![Voltage, Current, & Resistance
Potential Difference [V] (Volt, v)
charge will only flow when there is a difference in
potential (voltage) across a conductor
ex. Van de Graaff generator sparks but evens out
Voltage causes electrons to flow.
voltage
Current [I] (Amperes, Amps, A)
the flow of e’s I = Q / t
High
1 Amp = 1 C / 1 s Pressure
Low
flow Pressure
Resistance [R] (Ohms, )
resists the flow of electrons (friction)](https://image.slidesharecdn.com/6ohmslaw2-130131135047-phpapp01/85/6-ohm-s-law-2-1-320.jpg)
6 ohm's law 2
- 1. Voltage, Current, & Resistance Potential Difference [V] (Volt, v) charge will only flow when there is a difference in potential (voltage) across a conductor ex. Van de Graaff generator sparks but evens out Voltage causes electrons to flow. voltage Current [I] (Amperes, Amps, A) the flow of e’s I = Q / t High 1 Amp = 1 C / 1 s Pressure Low flow Pressure Resistance [R] (Ohms, ) resists the flow of electrons (friction)
- 2. Georg Simon Ohm (German) Ohm’s Law voltage makes the e’s want to flow (Current), resistance makes them not want to (Resistance) Which of Newton’s laws does this sound like? Current = Voltage / Resistance ex. What is the resistance of an electric frying pan that draws 12 amps of current when connected to a 120 v circuit? I = 12 amps V = I R V = 120 v 120 = 12 R R=? R = 10
- 3. Electric Power Electric Power The rate at which electric energy is converted into any other energy P=IV Electric Power = Current x Voltage 1 watt = 1 amp x 1 volt = C/s x J/C = J/s Usually measured in kilowatts. (But must be in watts in the equations.) If you know the power, how would you find the amount of energy? P = E/t E = Pt kilowatt-hours is another unit of energy: measures the # of kilowatts consumed in 1 hour. This is what the electric company measures off your meter!