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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
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
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.
Current Electricity & Ohm's Law.
ENGR 111 Lecture 3 Reading: Chapters 19, Class notes.
Measuring Electricity. Electrical Current Day to Day products that we all benefit from that rely on the movement of electrons Movement of electrons.
Current and Voltage. Current Flow rate of electricity Current flows from + to – Measured in Amps – 1 Amp = 1 Coulomb per second Actually electrons flow.
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley Electricity Physics 102 Goderya Chapter(s): 22 and 23 Learning Outcomes:
ELECTRIC CURRENT Electricity, like water, can only flow if charged particles have potential.
Electric Circuits Just like we can use pipes to carry water, we can use wires to carry electricity. We can use this concept to understand electric circuits.
Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?
Electrical Current Mr. Fleming.
PHY 2049 Chapter 26 Current and Resistance. Chapter 26 Current and Resistance In this chapter we will introduce the following new concepts: -Electric.
Amps, Volts and Resistance (Ohm’s Law). Coulomb Recall that one Coulomb has 6.25 X electrons. If the current coming out of the outlet on the.
4.2.3B Electrical Power What About Watts?. Power Law Moving electrons (current) requires ENERGY How much energy gets used depends on: Strength of push.
Chapter 7 Electricity. What is Charge? Protons have a (+) charge Electrons have a (-) charge Charge (q) is measured in Coulombs The elementary charge.
Kashif Bashir1 mailto: Web: kashifpaf.greatnow.comkashifpaf.greatnow.com OHM’s LAW.
Current Electricity If you found electrostatics shocking you’ll find this revolting.
CHAPTER 2 ELECTRICAL QUANTITIES AND OHM’S LAW. OBJECTIVE. AFTER TODAY, STUDENTS WILL UNDERSTAND THE ELECTRICAL VALUES OF AMPS, VOLTS, OHMS,AND WATTS.
Electric Circuits. Potential Electric Potential is just like gravitational potential It depends on –The distance from the source –The amount of charge.
2 But what makes the electrons flow? Any electrical circuit requires three things 1.A source 2.A load 3.A means of transmission A definition of a current.
Electric Current. Electric Potential Electrons in a circuit have potential energy –The energy is related to the force exerted by an electric field –The.
Energy and Electrostatics. A new definition of potential energy An object has potential energy due to its location within a force field. To change the.
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