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Resistors

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

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

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

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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 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

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Tolerance Band 44 44 77 77 00 = 4.7KΩ + / - 10% 10% What’s this thing?

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

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

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Resistor Code How to read the value of a resistor.

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