individu Plan and Solve stances: R₁ = R₂ = R3 = 15 2 What unknown are you trying to calculate? current=I=? What equation à can you use to find the unknown? Ohm's law: V = IR For a parallel circuit, V = IR where Reg is the equivalent resistance. Rearranging the equation gives you I = = First, find the equivalent resistance Req 150+15+15=0 1 Re Ω Ω =52 Req Ω V Req Then substitute for V and R to solve for I. 48 V 1= 5Ω === = 9.6 A 3. Look Back and Check Is your answer reasonable? Yes, a current of 9.6 A is reasonable, and the units are reasonable. Math Practice On a separate sheet of paper, solve the following problems. V or A, which is 1. Calculate the current in a 9-V battery that powers three 6-2 resistors parallel. Copyright Savvas Learning Company LLC. All Rights Reserved Conceptual Physics Reading and Study Workbook. Chapter 35

individu Plan and Solve stances: R₁ = R₂ = R3 = 15 2 What unknown are you trying to calculate? current=I=? What equation à can you use to find the unknown? Ohm's law: V = IR For a parallel circuit, V = IR where Reg is the equivalent resistance. Rearranging the equation gives you I = = First, find the equivalent resistance Req 150+15+15=0 1 Re Ω Ω =52 Req Ω V Req Then substitute for V and R to solve for I. 48 V 1= 5Ω === = 9.6 A 3. Look Back and Check Is your answer reasonable? Yes, a current of 9.6 A is reasonable, and the units are reasonable. Math Practice On a separate sheet of paper, solve the following problems. V or A, which is 1. Calculate the current in a 9-V battery that powers three 6-2 resistors parallel. Copyright Savvas Learning Company LLC. All Rights Reserved Conceptual Physics Reading and Study Workbook. Chapter 35

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Direct-current Circuits

Section: Chapter Questions

Problem 28.21P: Consider the circuit shown in Figure P28.21 on page 860. (a) Find the voltage across the 3.00-0...

See similar textbooks

Similar questions

Consider the circuit shown in Figure P28.21 on page 860. (a) Find the voltage across the 3.00-0 resistor, (b) Find the current in the 3.00-12 resistor.
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) Determine the equilibrium charge on the capacitor in the circuit of Figure P27.46 as a function of R. (b) Evaluate the charge when R = 10.0 . (c) Can the charge on the capacitor be zero? If so, for what value of R? (d) What is the maximum possible magnitude of the charge on the capacitor? For what value of R is it achieved? (c) Is it experimentally meaningful to take R = ? Explain your answer. If so, what charge magnitude does it imply? Figure P27.46
For the circuit shown in Figure P28.55. the ideal voltmeter reads 6.00 V and the ideal ammeter reads 3.00-k. Find (a) the value of K, (b) the emf of the battery, and (c) the voltage across the 3.00-kft resistor.
How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?
A 10.00-meter long wire cable that is made of copper has a resistance of 0.051 ohms, (a) What is the weight if the wire was made of copper? (b) What is the weight of a 10.00-meter-long wire of the same gauge made of aluminum? (c)What is the resistance of the aluminum wire? The density of copper is 8960 kg/m3 and the density of aluminum is 2760 kg/m3.
(a) What is the resistance of a 1.00 102-O, a 2.50-k O, and a 4.00-kresistor connected in series? (b) In parallel?
An ECG monitor must have an KC time constant lessthan 1.00102s to be able to measure variations involtage oversmall time intervals, (a) If the resistance of the circuit (duemostly to that of the patient's chest) is 1.00kTwhat is the maximum capacitance of the circuit?(b) Would It be difficult in practice to limit the capacitance to less than the value found in (a)?
Find the equivalent resistance between points a and b in Figure P27.33. Figure P27.33
Unreasonable Results (a) What current is needed to transmit 1.00 102 MW of power at 10.0kV? (b) Find the resistance of 1.00 km of wire that would cause a 0.0100% power loss. (c) What is the diameter of a 1.00-km-long copper wire having this resistance? (d) What is unreasonable about these results? (e) Which assumptions are unreasonable, or which premises are inconsistent?
(a) What is the resistance often 275-O resistors connected in series? (b) In parallel?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?