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Question-1. What is a resistor?
Answer-1: A resistor is an electrical component that opposes the flow of electric current in a circuit.
Question-2. What is resistivity?
Answer-2: Resistivity is a measure of a material's ability to resist the flow of electric current.
Question-3. How is resistivity different from resistance?
Answer-3: Resistance depends on both the material and the dimensions of the resistor, while resistivity is an intrinsic property of the material.
Question-4. What is the unit of resistivity?
Answer-4: The unit of resistivity is ohm-meter (Ω?m).
Question-5. What factors affect the resistivity of a material?
Answer-5: Temperature, impurities, and the material's atomic structure affect resistivity.
Question-6. What is the formula for calculating resistance using resistivity?
Answer-6: The formula is : R = Aρ?L?, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.
Question-7. What is the color code for resistors?
Answer-7: The color code is a system of colored bands used to indicate the resistance value of a resistor.
Question-8. How can you calculate the resistance of a resistor using its color bands?
Answer-8: By using a color code chart which assigns numeric values to colors representing digits, multipliers, and tolerance.
Question-9. What does the tolerance of a resistor indicate?
Answer-9: Tolerance indicates the maximum deviation from the specified resistance value.
Question-10. What is a variable resistor?
Answer-10: A variable resistor, also known as a potentiometer or rheostat, is a resistor whose resistance can be adjusted manually.
Question-11. How does temperature affect resistance?
Answer-11: In general, resistance increases with temperature for most conductors.
Question-12. What is the temperature coefficient of resistance?
Answer-12: The temperature coefficient of resistance (TCR) is a measure of how much the resistance of a material changes with temperature.
Question-13. What is the difference between a fixed resistor and a variable resistor?
Answer-13: A fixed resistor has a constant resistance value, while a variable resistor allows the resistance to be adjusted.
Question-14. What are the applications of resistors in electronic circuits?
Answer-14: Resistors are used for current limiting, voltage division, signal conditioning, and biasing in electronic circuits.
Question-15. What is the function of a pull-up resistor?
Answer-15: A pull-up resistor ensures that an input is at a defined logic level when no external signal is present.
Question-16. What is the difference between a series resistor and a parallel resistor?
Answer-16: In a series circuit, resistors are connected end-to-end, increasing total resistance. In a parallel circuit, resistors are connected across each other, decreasing total resistance.
Question-17. What is a resistor network?
Answer-17: A resistor network is a combination of multiple resistors in a single package, often used in integrated circuits.
Question-18. What is the power rating of a resistor?
Answer-18: The power rating of a resistor indicates the maximum amount of power it can dissipate without damage.
Question-19. What is a shunt resistor?
Answer-19: A shunt resistor is a low-value resistor connected in parallel with a component to measure current by voltage drop across it.
Question-20. How do you calculate the power dissipation in a resistor?
Answer-20: The formula is : P = I2 . R or P = V2 / R, where P is power, I is current, R is resistance and V is voltage.
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