Resistors Flashcards
Fixed, variable and non-linear resistors
What resistor is this?
Carbon-film resistor
What resistor is this?
Carbon Composite Resistor
What resistor is this?
Wire-Wound Resistor
What resistor is this?
Grid Resistor
What resistor is this?
Carbon-Film Variable Resistor
What resistor is this?
Wire-Wound Variable Resistor
What resistor is this?
Varistor
What resistor is this?
Thermistor
What resistor is this?
Light Dependant Resistor (LDR)
Name the four fixed Resistors
Carbon-film
Carbon-Composite
Wire-Wound
Grid
Name the two types of variable resistors
Potentiometer
Rheostat
What causes a non-linear resistor to change its resistance?
External factors such as heat, light or voltage.
Where are carbon-film and carbon composite resistors used and why
Electronics due to low power ratings
Where are wire-wound resistors used and why?
Power supplies and surge protection resistor networks, due to wide range of power ratings.
Where are grid resistors used and why?
High power applications such as for motor control, load banks and harmonic filtering, due to high power ratings.
What is the purpose of a potentiometer?
Voltage adjustment as a way of electrical control.
What is the purpose of rheostat?
Current adjustment used in motor control and electronic equipment (high and low power applications).
Where and why are varistors used?
Overvoltage (surge) applications due to as the metal-oxide layer provides very high resistance until a certain voltage.
When and Why are thermistors used
Temperature sensing and motor protection (thermal overload) due to its heat sensibility.
What is Positive Temperature Coefficient and Negative Temperature Coefficent?
Positive Temp Coefficent: Resistance increases as temperature increases.
Negaive Temp Coefficent: Resistances decreases as temperature increases.
When and why are Light Dependant Resistors used?
Lighting control applications as the Cadium sulfide track increases in resistance as lighting levels decrease.
How to easily remember Resistor Colour Code?
Beach Bums Rarely Offer You Gatorade But
Very Good Water.
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
