Resistors and Color-Code

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Resistors

Symbol

( R ) Resistance determines how much current will flow through a component.

Resistance is the opposition to Current

Resistors

Symbol

( R ) Resistance are used to control voltage and current levels. A very high resistance allows a small amount of current to flow.

Resistors

Symbol

( R ) Resistance is synonymous with a pipe for water. The smaller the pipe the more resistance and less water flows. The larger the pipe the less resistance and more water can flow.

Resistors

Symbol

( R ) Resistors A very low resistance allows a large amount of current to flow. Resistance is measured in ohms.

Resistors

Symbol

The unit of resistance is the ohm, which is equal to one volt per ampere, or one volt-second per coulomb.

Resistors

Symbol

The inverse of resistance, 1/R, is conductance (G), and its SI unit is the siemens (also unofficially called the mho).

Resistors

Symbol

The voltage measured across a resistor at a given instant is strictly proportional to the current passing through the resistor at that instant.

Resistors (types)

Low Power Resistors

Resistors (types)

High Power Resistors

Resistors (types)

Variable Low Power Resistors

Resistors (types)

Variable High Power Resistors

Resistors (types)

Cutaway view of various types of resistors

ResistorsPower Rating of Resistors

Resistors (Color Code)

ResistorsExample 1: Determine the value and tolerance of the resistor

1st band: orange = 32nd band: orange = 33rd band: red = 2 (i.e. 102)4th band: gold = 5%

= 33 x 102 = 3300 Ohms= 3.3 kOhms

Resistors (Alphanumeric label)

ResistorsExample 1: Determine the value and tolerance of the resistor

Answer = 1.1 MOhms

1M1

End of Presentation