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Published byShanna Irene Johnston Modified over 4 years ago

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Current Electricity

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Current A measure of the flow of charge. Ampere: Electrical measurement of the flow of electrons. 1 Ampere = 1 Coulomb/second. 1 Coulomb = 6,250,000,000,000,000,000 Electrons

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Current Water Analogy: current is gallons per minute. Symbol for Current = I

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Conventional Current Conventional current = positive charge flow. Electron Flow is in opposite direction

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Current

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Voltage The force that pushes electrons through a wire. Electrical Pressure or “Potential Difference”. Measured in Volts 1 volt = 1 joule/Coulomb

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Voltage Water analogy: Voltage is the water pressure supplied by the pump (battery) or a water tower. The symbol for voltage = V

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Resistance A resistor hinders the flow of current through a circuit. Ohm = unit of resistance (Ω)

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Resistance Water analogy: a waterwheel, constriction in pipe, or other object that hinders flow. Symbol is R

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Ohm’s Law Relates Current, Voltage, and Resistance. I = V/R Or.. R = V/I

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Where Does Voltage Originate? V = ∆PE / q ∆PE = work done on charge. (joules/coloumb)

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Relating Voltage to Electric Field V = ∆PE / q –Joules/coulomb E = V/d –Unit is N/C Electric field –directly proportional to applied voltage –Inversely proportional to distance between plates.

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