What effect would the following changes have on a conductor’s resistance? In each situation, explain why the change occurs in detail. If possible, type your answer! THANK YOU!! (a) decreasing the diameter of a conductor (b) placing an extension cord outside in the winter (c) plugging two identical extension cords together to make it longer

What effect would the following changes have on a conductor’s resistance? In each situation, explain why the change occurs in detail. If possible, type your answer! THANK YOU!! (a) decreasing the diameter of a conductor (b) placing an extension cord outside in the winter (c) plugging two identical extension cords together to make it longer

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 11OQ: When resistors with different resistances are connected in series, which of the following must be...

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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.
An automobile starter motor has an equivalent resistance of 0.0500 and is supplied by a 12.0-V battery with a 0.0100- internal resistance, (a) What is thecurrent to the motor? (b) What voltage is applied to it? (c) What power is supplied to the motor? (d) Repeat these calculations for when the battery connections are corroded and add 0.0900 to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)
What effect would the following changes have on a conductor’s resistance? In each situation, explain why the change occurs. (a) decreasing the diameter of a conductor (b) placing an extension cord outside in the winter (c) plugging two identical extension cords together to make it longer (d) changing from a copper conductor to a silver conductor
Which of the following is a formula for the power dissipated by a resistor? Let V be the voltage across the resistor, I be the current through the resistor, and R is the value of the resistance of the resistor. I2/R I2R V2R V/R
The resistors shown in the figure have the following values: R1= 80 ohms R2= 50 ohms R3= 130 ohms and R4= 200 ohms What is the equivalent resistance between points a and b? What is Req= the equivalent resistance between points band c? What is the equivalent resistance for the entire resistor arrangement (from a to c)? If a voltage difference deltaVac= 13volts is applied across the arrangement (from a to c), what is the total current flowing from a to c? What is the voltage difference between points a and b? What is the voltage difference between points b and c? How much current is flowing across resistor R3? How much current is flowing across resistor R4?
How would the value of each of the four following physical quantities change over time after the switch is closed? Explain why for each case in 1 or 2 sentences. (You may assume that the resistance of the batteries, the wires, and the switch are negligibly small for this question). a. The voltage across the capacitor, VCAP b. The voltage across the light bulb, VBULB c. The current through light bulb, IBULB d. VBULB + VCAP
Regarding the circuit in the left-hand part of the diagram: a) What is the current passing through each of the resistors? b) What is the current supplied by the battery? c) What is the potential difference across the 12 Ω resistor? d) How much power is turned to heat in the 4 Ω resistor? e) If we replace the circuit on the left by the one in the right-hand part of the diagram, with the same battery and only one resistor, what resistance Req should we choose to obtain the same total current?
James states that the resistance of a copper wire can be increased making it narrower and longer. Andrew disagrees and argues that resistance can be increased by heating the wire. Which one, if either, is correct, and why? a. James, because the conductivity of a copper wire does not increase when it is hammered. b. Andrew, because the conductivity of the wire decreases when it is heated. c. None of these options d. Andrew, because the conductivity of the wire increases when it is heated. e. Both are correct because the conductivity of a conductor is independent of its shape but decreases with increase in temperature. f. James, because the conductivity of a wire is directly proportional to its area and inversely proportional to its length.
Determine the magnitudes and directions of the currents in each resistor shown in the figure. The batteries have emfs of E1 = 8.2 V and E2= 11.8 V and the resistors have values of R1 = 30 Ω , R2 = 36 Ω , and R3 = 34 Ω. Part A) Ignore internal resistance of the batteries. Express your answers using two significant figures. Enter your answers numerically separated by commas. Part B) Which way is I1 directed? Part C) Which way is I2 directed? Part D) Which was is I3 directed? Part E) Assume each battery has internal resistance 1.3 Ω .Express your answers using two significant figures. Enter your answers numerically separated by commas. Part F) Directions of all I? Sorry for the length! thank you!
Consider the circuit shown below, with a battery of emf E = 20. V, and resistors R1 = 2.0 Ω, R2 = 5.0 Ω, R3 = 4.0 Ω, and R4 = 12 Ω. In this problem, give your answers to two significant figures a) What is the equivalent resistance of this set of resistors, in ohms? b) How much current Ibat flows through the battery, in amperes? c) How much current I1 flows through resistor R1, in amperes?
Consider the circuit shown in the figure, where 1 = 23.7 V,2 = 13.3 V and R = 12.0 Ω. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)(a)What is the current (in A) in each resistor? I1= A, I2= A, I3= A. (b)What is the power (in W) delivered to each resistor? P1= W, P2= W, P3= W.(c)What is the total power (in W) supplied by both batteries? (d)What is the relationship between the total power supplied by the batteries and the power delivered to each resistor? The total power supplied by the batteries is equal to the sum of the power delivered to each resistor .The total power supplied by the batteries is greater than the sum of the power delivered to each resistor. The total power supplied by the batteries is less than the sum of the power delivered to each resistor.
A person with body resistance between his hands of 13 kΩ accidentally grasps the terminals of a 15 kV power supply. A) What is the power dissipated in his body? Express your answer with the appropriate units. B)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 the above situation to be Imax=1.0mA or less? Express your answer with the appropriate units.