Three resistors of 25 N, 30 N and an unknown resistance R are connected in parallel and the combination is connected to a 16 V source. If the total current delivered by the source is 1.5 A, determine the following: A. The value of R. B. The current in each resistor. C. Which resistor dissipates the highest power? Show your solution. Based on your answer, what conclusion can be made?

Three resistors of 25 N, 30 N and an unknown resistance R are connected in parallel and the combination is connected to a 16 V source. If the total current delivered by the source is 1.5 A, determine the following: A. The value of R. B. The current in each resistor. C. Which resistor dissipates the highest power? Show your solution. Based on your answer, what conclusion can be made?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 24P: A person with body resistance between his hands of 10.0k accidentally grasps the terminals of...

See similar textbooks

Similar questions

A regular tetrahedron is a pyramid with a triangular base and triangular sides as shown in Figure P28.73. Imagine the six straight lines in Figure P28.73 are each 10.0- resistors, with junctions at the four vertices. A 12.0-V battery is connected to any two of the vertices. Find (a) the equivalent resistance of the tetrahedron between these vertices and (b) the current in the batten.
(a) A defibrillator sends a 6.00-A current through the chest of a patient by applying a 10,000-V potential as in the figure below. What is the resistance of the path? (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. Discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance. (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: P=I2 RP = .)
A 1,00-?O voltmeter is placed in parallel with a 75.0kresistor in a circuit, (a) Draw a circuit diagram of the connection, (b) What is the resistance of the combination? If the voltage across the combination is kept the same as it was across the 75.0-kresistor alone, what is the percent increase in current? (d) If the current through the combination is kept the same as it was through the 75.0-kresistor alone, what is the percentage decrease in voltage? (e) Are the changes found in parts (c) and (d) significant? Discuss.
A person with body resistance between his hands of 10.0k accidentally grasps the terminals of a20.0-kV power supply. (Do NOT do this!) (a) Draw a circuit diagram to represent the situation, (b) If the internal resistance of the power supply is 2000 , what is thecurrent through his body? (c) What is the power dissipated in his body? (d) If the power supply is to be made safe by increasing its internal resistance, what should the internal resistance be for the maximum current in this situation to be 1.00 mA or less? (e) Will this modification compromise the effectiveness of the power supply for driving low- resistance devices? Explain your reasoning.
Unreasonable Results (a) To what temperature must you raise a resistor made of constantan to double its resistance, assuming a constant temperature coefficient of resistivity? (b) To cut it in half? (c) What is unreasonable about these results? (d) Which assumptions are unreasonable, or which premises are inconsistent?
Answer the following 1. A voltage of 120V generates an IR drop across two resistors connected in series. If the voltage drop across R1 is 30V, what is the voltage drop across R2, in Volts? a) 80 b) 40 c) 100 d) 90 2. Three resistors R1, R2 and R3 of 20, 40 and 60 ohms are connected in parallel through the 120 V power line. What is the total current in the power line? a) 10A b) 12A c) 11A d) 15A 3. Resistors in a circuit are generally used to: a) increase the flow of the current b) decrease the flow of current c) avoid overvoltage d) decrease the power in the circuit
1) A resistor has a value of 20 ohms (Ω) when it is at 15 degrees Celsius. If the coefficient of thermal resistivity is 3.5 x 10-3/ Celsius, determine the value of the resistance at 97 degrees Celsius. Write your result to 3 significant figures. 2) A certain copper wire has a resistance of 10.0 ohm (Ω). a) At what point should the wire be cut so that the resistance of one segment is 4 times the resistance of the other segment? b) What is the resistance of each segment?
Q1: Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.60 seconds, what will be his final velocity and how far will he fall? Q2: A wire of length 3 m and area of cross-section 1.7 × 10-6 m2 has a resistance 3 × 10-2 ohm.a. What is the formula for resistivity of the wire and what is the unit of it?b. Calculate the resistivity of the wire.Q3: A point charge of −2 μC is located at the center of a cube with sides L=5 cm. What is the net electric flux through the surface?
A resistor is dissipating 114 milliwatts [mW] of power. The voltage across the resistor is 13 volts [V]. (a) What is the value of the resistance? Express your answer in units of ohms [Ω] using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal. (b) What is the current through the resistor? Express your answer in units of amperes [A] using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal.
A 150 ohm resistor is connected to a variable-voltage piwer supply. A.what voltage is necessary to cause a current of .3 A in the resistor? B.what current flows in the resistor when the voltage is 18 V?
A resistor is dissipating 119milliwatts [mW] of power. The voltage across the resistor is 26 volts [V]. (a) What is the value of the resistance? Express your answer in units of ohms[Ω]using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal. (b) What is the current through the resistor? Express your answer in units of amperes [A] using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal.
A photoresistor, whose resistance decreases with light intensity, is connected in the circuit of the figure. On a sunny day, the photoresistor has a resistance of 0.58 kΩ . On a cloudy day, the resistance rises to 4.4 kΩ . At night, the resistance is 22 kΩ . (Figure 1) Part A: What does the voltmeter read on a sunny day? Express your answer with the appropriate units. Part B: What does the voltmeter read on a cloudy day? Express your answer with the appropriate units Part C: What does the voltmeter read at night? Express your answer with the appropriate units. Part D: Does the voltmeter reading increase or decrease as the light intensity increases? The voltmeter reading increases because the current through the resistor decreases. The voltmeter reading decreases because the current through the resistor increases. The voltmeter reading decreases because the current through the resistor decreases. The voltmeter reading increases because the current through the resistor…