Current Electricity. Current A measure of the flow of charge. Ampere: Electrical measurement of the flow of electrons. 1 Ampere = 1 Coulomb/second. 1.

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Current Electricity & Ohm's Law.

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Presentation transcript:

Current Electricity

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

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

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

Current

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

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

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

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

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

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

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.