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RESISTORS - QUESTIONS

V. Ryan © 2005 - 2009

 

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Resistors determine the flow of current in an electrical circuit. Where there is high resistance then the flow of current is small, where the resistance is low the flow of current is large. Resistance, voltage and current are connected in an electrical circuit by Ohmís Law.

   
Read the passage regarding resistors. Fill the gaps using correct the words listed below.
   

Resistors _____________ the flow of current through a ____________. Resistance is measured in ____ When resistance is high the flow of current is _______ . When resistance is low the flow of current is _______Resistance, voltage and current are connected in an electrical circuit by ______________.

   

 

 
   
TYPES OF RESISTOR
   

A number of resistors are shown below. They include a VARIABLE RESISTOR, PRESET RESISTOR, FIXED RESISTOR, LIGHT DEPENDENT RESISTOR and a THERMISTOR. Using the guidelines above each drawing, print each correct name in BLOCK CAPITALS.

   
Draw an arrow from each resistor to its symbol. Please note, one of the resistors has two symbols.
   
Explain / describe the use of each of resistors listed below:
   
FIXED RESISTOR:
 
 
 
VARIABLE RESISTOR:
 
 
 
LIGHT DEPENDENT RESISTOR:
 
 
 
THERMISTOR:
 
 
 
PRESET RESISTOR:
 
 
 
 
 
The circuit diagram and 3D drawing below show the same light / dark sensor circuit. Add labels to both drawings, clearly identifying each component.
 

 

Why do you think a preset resistor is used on this sensor circuit?

 
 
 

How could a light / dark sensor be used to control a street lighting system?

 
 
 
 
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