1. Experiments Day 1 & 2 Resistors, Potentiometers and Photocells.

2. You should have a kit of electronic parts. First we will learn to identify the parts, then you will inventory them and later learn how they work The breadboard lets you connect components without soldering (pronounced sodd-er-ing) meaning to melt metal to join parts.

3. You should have A 9 volt battery to provide power. It should always be unplugged and put in a separate bag before you put your kit away.

4. You should have Lots of resistors At least 10 wires

5. You should have A speaker for making sounds A push button switch to turn circuits on and off

6. You should have At least 1 battery snap to connect the battery to the breadboard. Red is positive, black is negative. Some LED lights

7. You should have A diode (it’s very small) Some transistors (there are 2 different kinds, you need at least 1 of each: a 3904 and a3906)

8. You should have A photocell that detects light. It’s flat and has sort of a zigzag pattern on top A SCR which is a kind of switch

9. You should have A variety of capacitors. The small ones are ceramic, the larger ones are can capacitors

10. You should have A potentiometer. It has a knob you can turn One IC (integrated circuit) which is a 555 timer

11. 2 Battery Snaps Battery Speaker SCR Capacitors Photocell Push Button Transistors Diode 3 LED’s 555 Timer Potentiometer 15 Wires Solderless Breadboard

12. Inventory 1.Every day you receive your kit, TAKE INVENTORY. 2.Match all of the items in your kit with the inventory sheets in your kit. 3.Report any missing item to your teacher. 4.At the end of class, re-inventory your kit. Check around where you worked for any loose parts.

13. Learn how to identify the resistors

14. Resistors have color bands on them Colors are called the “color code” 4 bands on each resistor Band 1 = 1 st Digit Band 2 = 2 nd Digit Band 3 = Multiplier. Band 4 = tolerance Gold = 5% Silver = 10% If the 3 rd band is gold = /10 silver = /100

15. Most have 4 bands, the last band is usually silver or gold. Lay the resistor with the silver or gold band to the right and write down the numbers for the first 2 bands followed by the number of zeros for the 3 rd band. BlackBrownRedOrangeYellowGreenBlueVioletGrayWhite 0123456789

16. 10 ohm (Brown, Black, Black, Gold) 2 @ 47 ohm (Yellow, Violet, Black, Gold) 2 @ 100 ohm (Brown, Black, Brown, Gold) 3 @ 220 ohm (Red, Red, Brown, Gold) 3 @ 330 ohm (Orange, Orange Brown, Gold) 470 ohm (Yellow, Violet, Brown, Gold) 4 @ 1K ohm (Brown, Black, Red, Gold) 2.2K ohm (Red, Red, Red, Gold) 3.3K ohm (Orange, Orange, Red, Gold) 2 @ 6.8K ohm (Blue, Gray, Red, Gold) 3 @ 10K ohm (Brown, Black, Orange, Gold) 16K ohm (Brown, Blue, Orange, Gold) 2 @ 33K ohm (Orange, Orange, Orange, Gold) 120K ohm (Brown, Red, Yellow, Gold) 470K ohm (Yellow, Violet, Yellow, Gold)

17. QuantityDescriptionReplacement Cost 26Resistors25 cents each 8Capacitors50 cents each 1Potentiometer$1.50 each 1Silicon Coated Rectifier$1.00 each 1Diode25 cents each 3LED (Light Emitting Diode)25 cents each 1Photocell$1.00 each 29-volt battery lead50 cents each 15Solid Wires10 cents each 1555 Timer Chip50 cents each 1Push Button Switch$1.00 each 4Transistors50 cents each 1Speaker$2.00 each 1Solderless Circuit Board$6.00 each 19 volt battery$2.00 each

18. Review how a circuit works

19. Voltage is the electrical force that moves electrons through a conductor. V I R

20. CURRENT is the quantity or flow rate of electrons moving past a point within one second. V I R

21. Resistance is the force that reduces or stops the flow of electrons. V I R

22. Solderless Circuit Boards – The Bread Board On each side of the the “ditch” all the holes on each row are connected. We use the bread board to construct electronic circuits that we want to test. Because we do not use solder, it is easy to make changes and adjustments This is the “ditch”. It separates the sides. The holes are connected by rows not columns.