Choose true or false for each statement regarding the resistance of a wire. * While maintaining a constant voltage V, the current I increases when the resistivity p of a wire decreases. * While maintaining a constant voltage V, the current I decreases when the length L of a wire decreases. * The resistance is proportional to the cross-sectional area A of the wire. Submit Answer Tries 0/2 Choose true or false for each statement regarding resistors in a circuit. * Two identical resistors in parallel have half the resistance of each individual one. + If you connect two different resistors in series in a circuit, then the current that flows through each of them is different. * If you connect two different resistors in parallel in a circuit, then the voltage across each of them is the same. Submit Answer Tries 0/2

Choose true or false for each statement regarding the resistance of a wire. * While maintaining a constant voltage V, the current I increases when the resistivity p of a wire decreases. * While maintaining a constant voltage V, the current I decreases when the length L of a wire decreases. * The resistance is proportional to the cross-sectional area A of the wire. Submit Answer Tries 0/2 Choose true or false for each statement regarding resistors in a circuit. * Two identical resistors in parallel have half the resistance of each individual one. + If you connect two different resistors in series in a circuit, then the current that flows through each of them is different. * If you connect two different resistors in parallel in a circuit, then the voltage across each of them is the same. Submit Answer Tries 0/2

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Direct-current Circuits

Section: Chapter Questions

Problem 7P: You are working at an electronics fabrication shop. Your current project is on the team producing...

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Consider the circuits shown below, (a) What is the current through each resistor in part (a)? (b) What is the current through each resistor in part (b)? (c) What is the power dissipated or consumed by each circuit? (d) What is the power supplied to each circuit?
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.
Consider the circuit shown in Figure P18.11. Find (a) the potential difference between points a and b and (b) the current in the 20.0- resistor. Figure P18.11
The circuit shown in Figure P27.17 is connected for 2.00 min. (a) Determine the current in each branch of the circuit. (b) Find the energy delivered by each battery. (c) Find the energy delivered to each resistor. (d) Identify the type of energy storage transformation that occurs in the operation of the circuit. (e) Find the total amount of energy transformed into internal energy in the resistors.
Why is the following situation impossible? A technician is testing a circuit that contains a resistance R. He realizes that a better design for the circuit would include a resistance 73R rather than R. He has three additional resistors, each with resistance R. By combining these additional resistors in a certain combination that is then placed in series with the original resistor, he achieves the desired resistance.
Choose the words that make each statement correct. (i) When two or more resistors are connected in series, the equivalent resistance is always [(a) greater than; (b) less than] any individual resistance. (ii) When two or more resistors are connected in parallel, the equivalent resistance is always [(c) greater than; (d) less than] any individual resistance.
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Consider the two circuits shown in Figure P27.5 in which the batteries are identical. The resistance of each lightbulb is R. Neglect the internal resistances of the batteries. (a) Find expressions for the currents in each lightbulb. (b) How does the brightness of B compare with that of C? Explain. (c) How does the brightness of A compare with that of B and of C? Explain. Figure P27.5
A 12-V battery is connected across a device with variable resistance. As the resistance of the device increases, determine whether the following quantities increase, decrease, or remain unchanged. Indicate your answers with I, D, or U, respectively. (a) The current through the device. (b) The voltage across the device. (c) The power consumed by the device.
For the circuit shown in Figure P28.24, calculate (a) the current in the 2.00-11 resistor and (b) the potential difference between points a and b.
An uncharged series RC circuit is to be connected across a battery. For each of the following changes, determine whether the time for the capacitor to reach 90% of its final charge would increase, decrease, or remain unchanged. Indicate your answers with I, D, or U, respectively. (a) The RC time constant is doubled. (b) The battery voltage is doubled. (c) A second resistor is added in series with the original resistor.
Consider the circuit shown in Figure P18.10. (a) Calculate the equivalent resistance of the 10.0- and 5.00- resistors connected in parallel. (b) Using the result of part (a), calculate the combined resistance of the 10.0-, 5.00-, and 4.00- resistors. (c) Calculate the equivalent resistance of the combined resistance found in part (b) and the parallel 3.00- resistor. (d) Combine the equivalent resistance found in part (c) with the 2.00- resistor. (e) Calculate the total current in the circuit. (f) What is the voltage drop across the 2.00- resistor? (g) Subtracting the result of part (f) from the battery voltage, find the voltage across the 3.00- resistor. (h) Calculate the current in the 3.00- resistor. Figure P18.10