AP_Physics_B_-_Electric_Circuits

# AP_Physics_B_-_Electric_Circuits - ElectricCircuits AP...

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Electric Circuits AP Physics B

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Potential Difference =Voltage=EMF In a battery, a series of chemical reactions occur in which electrons are transferred from one terminal to another. There is a potential difference (voltage) between these poles. The maximum potential difference a power source can have is called the electromotive force or (EMF), ε . The term isn't actually a force, simply the amount of energy per charge (J/C or V)
A Basic Circuit All electric circuits have three main parts 1. A source of energy 2. A closed path 3. A device which uses the energy If ANY part of the circuit is open the device will not work!

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Electricity can be symbolic of Fluids Circuits are very similar to water flowing through a pipe A pump basically works on TWO IMPORTANT PRINCIPLES concerning its flow There is a PRESSURE DIFFERENCE where the flow begins and ends A certain AMOUNT of flow passes each SECOND . A circuit basically works on TWO IMPORTANT PRINCIPLES There is a " POTENTIAL DIFFERENCE aka VOLTAGE " from where the charge begins to where it ends The AMOUNT of CHARGE that flows PER SECOND is called CURRENT .
Current Current is defined as the rate at which charge flows through a surface. The current is in the same direction as the flow of positive charge (for this course) Note: The “I” stands for intensity

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There are 2 types of Current DC = Direct Current - current flows in one direction Example: Battery AC = Alternating Current - current reverses direction many times per second. This suggests that AC devices turn OFF and ON. Example: Wall outlet (progress energy)
Ohm’s Law “The voltage (potential difference, emf) is directly related to the current, when the resistance is constant” IR IR V R R I V = = = = ε α Resistance ality proportion of constant Voltage vs. Current 0 1 2 3 4 5 6 7 8 9 10 0 0.2 0.4 0.6 0.8 1 Current(Amps) Voltage(V) Voltage(V) Since R= V/I, the resistance is the SLOPE of a V vs. I graph R = r e s i t a n c l o p

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## This note was uploaded on 11/18/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.

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AP_Physics_B_-_Electric_Circuits - ElectricCircuits AP...

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