www.hdvidi.tv Resistance and Ohms Law. I promised just a little math, unfortunately you do need some, and the most important math to our projects is included here. I will also put some links below so you can order parts for our first couple of labs. No I do not work for allelectronics.com, I just use them for myself because they are not that expensive. Feel free to purchase from your favorite place. Also feel free to buy more of the each of the parts, I am only including enough for the first couple of labs, plus a few extras in case you burn out a part 10 - 470 ohm 1/4 watt resistors http://www.allelectronics.com/make-a-store/item/291-470/470-OHM-1/4-WATT/1.html 5 - 22K OHM 1/4 WATT http://www.allelectronics.com/make-a-store/item/291-22K/22K-OHM-1/4-WATT/1.html 5 - 100K OHM 1/4 WATT http://www.allelectronics.com/make-a-store/item/291-100K/100K-OHM-1/4-WATT/1.html 2 - 100K MULTI-TURN TRIMMER POT http://www.allelectronics.com/make-a-store/item/MTP-100K/100K-MULTI-TURN-TRIMMER-POT/1.html 2 - 1K OHM 1/4 WATT http://www.allelectronics.com/make-a-store/item/291-1K/1K-OHM-1/4-WATT/1.html 2 - 220K OHM 1/4 WATT http://www.allelectronics.com/make-a-store/item/291-220K/220K-OHM-1/4-WATT/1.html 2 - 100K SINGLE TURN TRIMPOT http://www.allelectronics.com/make-a-store/item/TPS-100K/100K-SINGLE-TURN-TRIMPOT/1.html 2 - RECTIFIER DIODE 1AMP/1000PIV http://www.allelectronics.com/index.php?page=search&search;_query=1n4007&x;=0&y;=0 2 - 10uf Electrolytic capacitors http://www.allelectronics.com/make-a-store/item/10-50RS/10-UF-50-VOLT-RADIAL-ELECTROLYTIC-SPECIAL/1.html 2 - 1000uf Electrolytic capacitors http://www.allelectronics.com/make-a-store/item/1000R100/1000UF-100V-ELECTROLYTIC-CAPACITOR-RADIAL/1.html 2 - 9 VOLT BATTERY SNAP, 3" LEADS http://www.allelectronics.com/make-a-store/item/BST-3/9-VOLT-BATTERY-SNAP-3-LEADS//1.html 10 - LEDs any color - I just linked green below, and this is super bright, you get get something less expensive, and it will work just fine. http://www.allelectronics.com/make-a-store/item/LED-128/SPECIAL-ULTRABRIGHT-GREEN-LED/1.html 2 - 9 Volt Batteries http://www.allelectronics.com/make-a-store/item/PRC-1604/9-VOLT-DURACELL-PROCELL//1.html 2 - Pushbuttons http://www.allelectronics.com/make-a-store/item/PB-126/SUB-MINI-PC-MOUNT-PUSHBUTTON//1.html 5 - NPN transistors http://www.allelectronics.com/make-a-store/item/MPSA06-HM/MPSA06-NPN-TRANSISTOR-HOUSE-MARKED/1.html 5 - PNP transistors http://www.allelectronics.com/make-a-store/item/MPSA56-HM/MPSA56-PNP-TRANSISTOR-HOUSE-MARKED/1.html 2 - 3-18 VDC PIEZO BUZZER http://www.allelectronics.com/make-a-store/item/SBZ-204/3-18-VDC-PIEZO-BUZZER/1.html 3 - 3-20 VDC MOTOR http://www.allelectronics.com/make-a-store/item/DCM-330/3-20-VDC-MOTOR-MABUCHI/1.html 1 - SOLDERLESS BREADBOARD http://www.allelectronics.com/make-a-store/item/PB-400/SOLDERLESS-BREADBOARD-400-CONTACTS//1.html 1 pack Alligator Test Leads -10pc http://www.makershed.com/ProductDetails.asp?ProductCode=MKEL16 1 Pack Deluxe Breadboard Jumper Wires http://www.makershed.com/ProductDetails.asp?ProductCode=MKSEEED3 3 1/2 DIGIT LCD MULTIMETER http://www.allelectronics.com/make-a-store/item/DMM-6162/3-1/2-DIGIT-LCD-MULTIMETER-W/BACKLIGHT/1.html Photo Cell or LDR http://www.sparkfun.com/products/9088 That should do it for now. When I purchase either the amount I recommended, or the minimum I could purchase if it was more, my cart came to $50.00 US not including shipping, or the wires from maker shed, or the Multimeter.