Passive Solid State Devices: Resistors

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Questions and Answers

What is the main function of a resistor in a circuit?

To increase the current flow

To control the flow of current (correct)

To provide a constant voltage

To amplify the electrical signals

Which equation correctly defines resistance?

R = 1/(ρXL/A)

R = ρXL/A (correct)

R = A/(ρXL)

R = ρA/XL

What factors can cause real resistors to deviate from ideal behavior?

Changing temperature and applied voltage (correct)

Constant current and resistance value

Material type and construction

Constant voltage and environment temperature

What additional characteristics must be defined when selecting a resistor?

Resistance value and tolerance Signup and view all the answers

In an ideal resistor, how does resistance change with environmental factors?

It remains constant Signup and view all the answers

What is a common issue with real resistors that does not occur in ideal resistors?

Introduction of inductance Signup and view all the answers

Which is NOT a common power rating for standard resistors?

12 watts Signup and view all the answers

Which type of resistor package does NOT have wire leads?

Surface-mount package Signup and view all the answers

Which type of resistor predominantly replaced carbon composition resistors after the 1960s?

Film resistors Signup and view all the answers

What is a significant advantage of carbon composition resistors?

Inexpensiveness Signup and view all the answers

Which of the following is NOT a disadvantage of carbon composition resistors?

Extremely durable Signup and view all the answers

What materials make up the resistive element of carbon composition resistors?

Powdered carbon and ceramic Signup and view all the answers

What does the temperature coefficient of resistance (TCR) for carbon composition resistors indicate?

The effect of temperature on resistance value Signup and view all the answers

Why are carbon composition resistors not recommended for low noise applications?

They exhibit higher noise levels Signup and view all the answers

Which characteristic of carbon composition resistors contributes to their ruggedness?

High thermal mass Signup and view all the answers

What change might occur in carbon composition resistors over a one-year shelf life?

Resistance value change up to 5% Signup and view all the answers

Study Notes

Passive Solid State Devices

Passive solid-state devices are resistors, capacitors, and inductors.

Resistors

Resistors control the flow of current and dissipate power.
Resistance (R) is calculated as ρXL/A, where ρ is resistivity, XL is length, and A is cross-sectional area.
Conductance (G) is the inverse of resistance.
Real resistors have variations in resistance due to temperature, other environmental factors, and voltage & current changes.

Resistor Types

Carbon Composition resistors were the primary resistor type before the 1960s.
Wirewound resistors were also used in the 1960s and before.
Film resistors are prevalent today.
Common resistor types include:
- Carbon composition
- Wirewound
- Film
- Thick and thin film resistors

Carbon Composition Resistors

Made from powdered carbon and ceramic mixed with resin.
They have a higher energy capability compared to other types.
Carbon resistors can achieve higher resistance values than wirewound resistors.
They are inexpensive but have limitations:
- High temperature coefficient of resistance (TCR)
- Positive voltage coefficient (VCR)
- Not suitable for low noise applications
- Resistance value can change up to 5% over a year.

Resistor Selection Criteria

For selecting a resistor, the following criteria must be defined:
- Resistance value
- Tolerance
- Power rating
- Temperature coefficient
- Type - (material and construction)

Resistors in Use

Power ratings for standard resistors are 1/8 watt, 1/4 watt, 1/2 watt, 1 watt, and 2 watts.
Resistors can be packaged in "through-hole component" (THC) formats with wire leads or as "surface-mount" packages without wire leads.

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Description

This quiz focuses on passive solid state devices, specifically resistors. It covers their function, types, and the factors affecting resistance. Test your knowledge on the characteristics and applications of different resistor types.