Resistance & Resistor

Resistance & Resistor

​objectives :

• ​Calculate total Resistance given series, parallel and series/parallel arrangements

• ​Given the Resistance colour code, determine the value and tolerance of unknown Resistors so coded

• Calculate maximum and minimum values of fixed Resistors given the nominal value and tolerance

• Define Specific Resistance

• Describe the effect of the following on Resistance value:

  • Cross Sectional Area (csa)

  • Length (l)

  • Specific Resistance (ρ)

​objectives :

• Calculate nominal Resistance value given cross sectional area, length, Specific Resistance and formula

• Explain the significance of a Resistor’s Wattage rating

• Describe the following in terms of their operation, ATA100 symbols and uses:

  • ​Potentiometers

  • Rheostats

• ​Describe a Wheatstone Bridge in terms of its operation and uses

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​Type of Resistors :

• ​Fixed Resistor

• ​Wire Wound

• ​variable resistors

  • ​Rheostat

  • ​Potentiometer

    1. ​Linear

    2. ​Tapered

  • ​Thermistors

Rheostat

​​Photo Conductive Cells

​Wheatstone Bridge