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Questions and Answers
What is the main function of a resistor in a circuit?
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?
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?
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?
What additional characteristics must be defined when selecting a resistor?
In an ideal resistor, how does resistance change with environmental factors?
In an ideal resistor, how does resistance change with environmental factors?
What is a common issue with real resistors that does not occur in ideal resistors?
What is a common issue with real resistors that does not occur in ideal resistors?
Which is NOT a common power rating for standard resistors?
Which is NOT a common power rating for standard resistors?
Which type of resistor package does NOT have wire leads?
Which type of resistor package does NOT have wire leads?
Which type of resistor predominantly replaced carbon composition resistors after the 1960s?
Which type of resistor predominantly replaced carbon composition resistors after the 1960s?
What is a significant advantage of carbon composition resistors?
What is a significant advantage of carbon composition resistors?
Which of the following is NOT a disadvantage of carbon composition resistors?
Which of the following is NOT a disadvantage of carbon composition resistors?
What materials make up the resistive element of carbon composition resistors?
What materials make up the resistive element of carbon composition resistors?
What does the temperature coefficient of resistance (TCR) for carbon composition resistors indicate?
What does the temperature coefficient of resistance (TCR) for carbon composition resistors indicate?
Why are carbon composition resistors not recommended for low noise applications?
Why are carbon composition resistors not recommended for low noise applications?
Which characteristic of carbon composition resistors contributes to their ruggedness?
Which characteristic of carbon composition resistors contributes to their ruggedness?
What change might occur in carbon composition resistors over a one-year shelf life?
What change might occur in carbon composition resistors over a one-year shelf life?
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.
