Unit 5 Resistors Questions

Question 8: A 10,000-Ω resistor has a tolerance of 5%. What are the minimum and maximum values of this resistor?

Answer: 10,000-Ω x 0.05 = 500. 10,000 Ω ± 500 Ω = 10,500 Ω, 9,500 Ω.

Question 7: A resistor has color bands of orange, blue, yellow, and gold. What are the resistance and tolerance of this resistor?

Answer: 360,000 Ω, ±5%

Question 4: How should tubular wire-wound resistors be mounted and why?

Answer: A tubular wire-wound resistor be mounted vertically because the power dissipating through a resistor would overheat on the surface if it is placed horizontally.

Question 6: A 1-W, 350-Ω resistor is connected to 24 V. Is this resistor operating within its power rating.

Answer: No, it is not capable of operating within its power rating. The current is 0.069 A and if multiplied 0.069 A x 24 V to get power, it would equal to 1.66 W; which the power rating of a resistor is exceeded and going to damage the resistor.

Question 10: What is a potentiometer?

Answer: Potentiometer also known as pot, is a variable resistors that can controls ranges of resistance. It is essentially a voltage divide and used to control the volume of an audio speaker.

Question 2: What is the advantage of a metal film resistor over a carbon resistor?

Answer: The advantage of a metal film resistor is its high resistance tolerance.

Question 3: What is the advantage of wire-wound resistor?

Answer: The advantage of a wire-wound resistor is that it operates on a high temperature rating than any type of resistor.

Question 9: Is 51,000 Ω a standard value for a 5% resistor?

Answer: Yes, it is a standard value for a 5% resistor

Question 5: A 0.5-W, 2000-Ω resistor has a current flow of 0.01 A through it. Is this resistor operating within its power rating?

Answer: Yes, it is capable of operating within its power rating. If we used Ohm's law to find the voltage (2000 Ω x 0.01 = 20 V), we get 20 V. To find power it is voltage x amperes, (20 x 0.01 = 0.2 W). The power dissipated within the circuit is 0.2 W and the resistor has a power rating of 0.5 which it is enough to withstand through the circuit.

Question 1: Name three types of fixed resistors.

Definition of a fixed resistor that has 1 ohmic value and cannot be changed or adjusted, the values are determined by the color bands or code. Answer 1: Composition carbon resistor Answer 2: Metal flim resistor Answer 3: Metal glaze resistor