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

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

Current

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

Power Hydroelectric sites/glencany/glencany.html cct/2005/july15/27no141a.htm

Power Hydroelectric sites/glencany/glencany.html cct/2005/july15/27no141a.htm Power = voltage x current Water analogy: power = altitude drop x flow

Resistor

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

Capacitor

Capacitor stores charge Water analogy: tank stores water

Inductor Rides/rally/2005_Rally.html

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

LED product/index0.htm junk/xmas2002/lit_waterfall1.jpg

LED LED lights up and acts like voltage drop Water analogy: lit waterfall product/index0.htm junk/xmas2002/lit_waterfall1.jpg

Transistor

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

Op-Amp

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

Ohm’s Law

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

Kirchhoff’s Voltage Law

Sum of voltage drops around loop = 0 Water analogy: total altitude change for loop = 0

Kirchhoff’s Current Law

Sum of current flowing out of node = 0 Water analogy: what flows in must flow out

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