Resistors

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Resistors
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Resistors

• An electrical component that opposes the flow of
  electrons

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• Resistors reduce the electrical pressure
• Voltage is dropped
• Current remains the same

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• So there is an energy change! Then whats all
  this energy being converted into?

HEAT
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Types of Resistors

• Fixed - resistor
• Variable -potentiometer
• Light sensitive -photoresistor
• Thermal- thermistor

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The Resistor Code

• Decoding Resistor Values

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Reading the Resistor
Start at band closest to the end of the resistor

• 1st Digit
• 2nd Digit
• of Zeros
• Tolerance Stripe

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Tolerance Stripe

• The tolerance is the amount in percent that the
  resistor is allowed to be off from its stated
  value

• /-20 -No Stripe
• /-10 -Silver Stripe
• /-5 - Gold Stripe

What is the value of this resistor?
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Tolerance Band

• 4

• 7

• 00

• 10

4.7K? /- 10
Whats this thing?
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• Omega- a Greek symbol used to represent Ohms, the
  unit of measure for resistance!

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Reading the Resistor
0______________ 1______________ 2___________
___ 3______________ 4______________ 5_______
_______ 6______________ 7______________ 8___
___________ 9______________ No
Stripe______________ Silver Stripe____________
Gold Stripe____________
YELLOW

VIOLET
RED
SILVER
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What is the value of these resistors?

1. ___
2. ___
3. ___
4. ___

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