1. Resistors

2.  An electrical component that opposes the flow of electrons - - - - - - - - ?...! - - - - - - - -

3.  Resistors reduce the electrical pressure  Voltage is dropped  Current remains the same  Resistors reduce the electrical pressure  Voltage is dropped  Current remains the same --------- - - -- - - - - - - - -

4.  So there is an energy change! Then what’s all this energy being converted into? --------- - - -- - - - - - - - - HEAT

5. Types of Resistors  Fixed - resistor  Variable -potentiometer  Light sensitive -photoresistor  Thermal- thermistor  Fixed - resistor  Variable -potentiometer  Light sensitive -photoresistor  Thermal- thermistor

6. The Resistor Code Decoding Resistor Values

7. Reading the Resistor  1st Digit  2nd Digit  # of Zeros  Tolerance Stripe  1st Digit  2nd Digit  # of Zeros  Tolerance Stripe Start at band closest to the end of the resistor

8. Tolerance Stripe  The tolerance is the amount in percent that the resistor is allowed to be off from its stated value What is the value of this resistor?  +/-20% -No Stripe  +/-10% -Silver Stripe  +/-5% - Gold Stripe  +/-20% -No Stripe  +/-10% -Silver Stripe  +/-5% - Gold Stripe

9. Tolerance Band 44 44 77 77  00 = 4.7KΩ + / - 10%  10% What’s this thing?

10. ``  Omega- a Greek symbol used to represent Ohms, the unit of measure for resistance! Ω

11. Reading the Resistor                 0:______________ 1:______________ 2:______________ 3:______________ 4:______________ 5:______________ 6:______________ 7:______________ 8:______________ 9:______________ No Stripe:______________ Silver Stripe:____________ Gold Stripe:____________ RED VIOLET YELLOW SILVER

12. What is the value of these resistors? 1.___ 2.___ 3.___ 4.___

13. What is the value of these resistors? 5. 6. 7. 8.