Learning Materials
Features
Discover
Chapter 21: Q40PE (page 776)
Find the currents flowing in the circuit in Figure 21.47.
The currents flowing in the circuit
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
Apply the junction rule at point a in Figure 21.52.
There is a voltage across an open switch, such as in Figure 21.43. Why, then, is the power dissipated by the open switch small.
Consider the circuit in Figure21.53, and suppose that the emfs are unknown and the currents are given to be. (a) Could you find the emfs? (b) What is wrong with the assumptions?
A \(160 - \mu F\)capacitor charged to \(450\;V\)is discharged through a \(31.2 - k\Omega \)resistor. (a) Find the time constant.(b) Calculate the temperature increase of the resistor, given that its mass is \(2.50\;g\)and its specific heat is \(1.67\frac{{kJ}}{{kg{ \cdot ^\circ }C}}\), noting that most of the thermal energy is retained in the short time of the discharge. (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?
Referring to the example combining series and parallel circuits and Figure 21.6, calculate in the following two different ways: (a) from the known values of and ; (b) using Ohm's law for . In both parts explicitly show how you follow the steps in the Problem-Solving Strategies for Series and Parallel Resistors.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App