Electronics: Intro Quantities: Voltage Current Power Devices: Resistor

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Presentation transcript:

Electronics: Intro Quantities: Voltage Current Power Devices: Resistor Capacitor Inductor LED Transistor Op-Amp Laws: Ohm’s Law Kirchhoff’s Laws

Voltage

Voltage Voltage = pressure that pushes electrons through circuit Water analogy: voltage = altitude of water

Current

Current Current = flow of electrons through circuit Water analogy: current = flow of water

Power http://www.usbr.gov/power/data/sites/glencany/glencany.html http://en.wikipedia.org/wiki/Hydroelectric http://www.wapa.gov/newsroom/cct/2005/july15/27no141a.htm

Power Power = voltage x current http://www.usbr.gov/power/data/sites/glencany/glencany.html http://en.wikipedia.org/wiki/Hydroelectric http://www.wapa.gov/newsroom/cct/2005/july15/27no141a.htm Power = voltage x current Water analogy: power = altitude drop x flow

Resistor

Resistor Resistor reduces current flow Water analogy: flow less for winding river

Capacitor

Capacitor Capacitor stores charge Water analogy: tank stores water

Inductor http://www.magnariders.com/html/Rides/rally/2005_Rally.html

Inductor Inductor creates magnetic field opposing current change http://www.magnariders.com/html/Rides/rally/2005_Rally.html Inductor creates magnetic field opposing current change Water analogy: mill wheel with inertia opposes flow change

LED http://www.furuier.com/english/product/index0.htm http://www.xmission.com/~m3lody/junk/xmas2002/lit_waterfall1.jpg

LED LED lights up and acts like voltage drop http://www.furuier.com/english/product/index0.htm http://www.xmission.com/~m3lody/junk/xmas2002/lit_waterfall1.jpg LED lights up and acts like voltage drop Water analogy: lit waterfall

Transistor

Transistor Transistor current flow controlled by second small current flow Water analogy: spillway for dam controlled by hydraulic line

Op-Amp

Op-Amp Op-amp magnifies voltage across inputs Water analogy: Lever translates small pressure into high pressure

Ohm’s Law

Ohm’s Law Current in resistor = voltage / resistance Water analogy: flow = altitude drop / length of river

Kirchhoff’s Voltage Law

Kirchhoff’s Voltage Law Sum of voltage drops around loop = 0 Water analogy: total altitude change for loop = 0

Kirchhoff’s Current Law

Kirchhoff’s Current Law Sum of current flowing out of node = 0 Water analogy: what flows in must flow out