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DC Theory > Resistors > Flashcards

Resistors Flashcards

Fixed, variable and non-linear resistors

1
Q

What resistor is this?

A

Carbon-film resistor

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2
Q

What resistor is this?

A

Carbon Composite Resistor

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3
Q

What resistor is this?

A

Wire-Wound Resistor

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4
Q

What resistor is this?

A

Grid Resistor

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5
Q

What resistor is this?

A

Carbon-Film Variable Resistor

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6
Q

What resistor is this?

A

Wire-Wound Variable Resistor

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7
Q

What resistor is this?

A

Varistor

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8
Q

What resistor is this?

A

Thermistor

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9
Q

What resistor is this?

A

Light Dependant Resistor (LDR)

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10
Q

Name the four fixed Resistors

A

Carbon-film

Carbon-Composite

Wire-Wound

Grid

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11
Q

Name the two types of variable resistors

A

Potentiometer

Rheostat

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12
Q

What causes a non-linear resistor to change its resistance?

A

External factors such as heat, light or voltage.

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13
Q

Where are carbon-film and carbon composite resistors used and why

A

Electronics due to low power ratings

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14
Q

Where are wire-wound resistors used and why?

A

Power supplies and surge protection resistor networks, due to wide range of power ratings.

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15
Q

Where are grid resistors used and why?

A

High power applications such as for motor control, load banks and harmonic filtering, due to high power ratings.

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16
Q

What is the purpose of a potentiometer?

A

Voltage adjustment as a way of electrical control.

17
Q

What is the purpose of rheostat?

A

Current adjustment used in motor control and electronic equipment (high and low power applications).

18
Q

Where and why are varistors used?

A

Overvoltage (surge) applications due to as the metal-oxide layer provides very high resistance until a certain voltage.

19
Q

When and Why are thermistors used

A

Temperature sensing and motor protection (thermal overload) due to its heat sensibility.

20
Q

What is Positive Temperature Coefficient and Negative Temperature Coefficent?

A

Positive Temp Coefficent: Resistance increases as temperature increases.

Negaive Temp Coefficent: Resistances decreases as temperature increases.

21
Q

When and why are Light Dependant Resistors used?

A

Lighting control applications as the Cadium sulfide track increases in resistance as lighting levels decrease.

22
Q

How to easily remember Resistor Colour Code?

A

Beach Bums Rarely Offer You Gatorade But

Very Good Water.

Black

Brown

Red

Orange

Yellow

Green

Blue

Violet

Gray

White

DC Theory (6 decks)

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