it was an old question on exam, and I want know jow I can solve this question. 4. (a) Define the electromotive force and explain the physical mechanism of theelectromotive force source.(b) One circuit has constructed by electromotive force source which has ɛ = 5Vand inner resistivity r = 12. Two serial connected resistances which havevalues of R11N and R25N placed in that circuit. Calculate the%3Dpowers dissipated in R1, R2 and r.• Gauss's law:qin€0Here E is the electric field vector, da is the surface element vector, qin is thetotal charge enclosed by the Gaussian surface, €o is the electric constant. Theintegral is taken over the closed Gaussian surface.• Electric potential at point P due to charge q is given byV = k2.1 q4T€0 rwhere r is the distance between the point P and the charge q. k = 9 x10°NM2/C², eo= 8.854 × 10-12C²/(Nm²).• The power is defined byP = VI = I²R= V² /R

(A) Electromotive Force : Electromotive force is electric potential difference produced by an…

4. (a) Define the electromotive force and explain the physical mechanism of the electromotive force source. (b) One circuit has constructed by electromotive force source which has ɛ = 5V and inner resistivity r = values of R1 powers dissipated in R1, R2 and r. 1N. Two serial connected resistances which have 5N placed in that circuit. Calculate the IN and R2

4. (a) Define the electromotive force and explain the physical mechanism of the electromotive force source. (b) One circuit has constructed by electromotive force source which has ɛ = 5V and inner resistivity r = values of R1 powers dissipated in R1, R2 and r. 1N. Two serial connected resistances which have 5N placed in that circuit. Calculate the IN and R2

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter21: Circuits And Dc Instruments

Section: Chapter Questions

Problem 39CQ: An electronic apparatus may have large capacitors at high voltage in the power supply section,...

See similar textbooks

Similar questions

26- If the ratio of current intensities passing over X and Y conductors connected in parallel as in the figure is Ix/Iy = 2, and the ratio of resistivity is px/py =1/4, what is the ratio of cross-section radii rx/ry?
My homework asks : " rest is given in the question. Can you help with my homework? Current through a conductor, I (t) = I0Over time according to e-tf-r relationIt decreases exponentially. Where / 0 (at t = O) is the initial current,r is a constant in unit of time. A fixed observation point inside the conductorLet's take it. How much load passes through this point between t = O and t = 3r?e = 2.718
An electronic apparatus may have large capacitors at high voltage in the power supply section, presenting a shock hazard even when the apparatus is switched off. A “bleeder resistor” is therefore placed across such a capacitor, as shown schematically in Figure, to bleed the charge from it after the apparatus is off. Why must the bleeder resistance be much greater than theeffective resistance of the rest of the circuit? How does this affect the time constant for discharging the capacitor?
KIRCHHOFF'S LAW How we plus-minus current signs determined? Explain why the kitchen lights become dimmer when a toaster is turned on. What will be the effect upon the solution of a problem if a current direction is arbitrary assumed incorrectly? What is the significance of negative values of voltage and currents?
Using the results of the above example on Example 20.3, find the drift velocity in a copper wire of twice the diameter and carrying 20.0A.
Nichrome wire is used in some radiative heaters. (a) Find the resistance needed if the average power output is to be 1.00 kW utilizing 120-V AC. (b) What length of Nichrome wire, having a cross-sectional area of 5.00mm2, is needed if the operating temperature is 500°C ? (c) What power will it draw when first switched on?
Would your headlights dim when you start your car's engine if the wires in your automobile were superconductors? (Do not neglect the battery’s internal resistance.) Explain.
If the drift velocity in a conductor is so small, then why does an auto battery influence the starter as soon as you turn the ignition switch?
Integrated Concepts Use the ECG in Figure 20.34 to determine the heart rate in beats per minute assuming a constant time between beats. Figure 20.34 A lead II ECG with corresponding arterial blood pressure. The QRS complex is created by the depolarization and contraction of the ventricles and is followed shortly by the maximum or systolic blood pressure. See text for further description.
Integrated Concepts Derive an expression for the current in a system like that in Figure 23.11, under the following conditions. The resistance between the rails is R, the rails and the moving red are identical in cross section A and have the same resistivity . The distance between the rails is l, and the rod moves at constant speed v perpendicular to the uniform field B. At time zero, the moving red is next to the resistance R.
Check Your Understanding When using Kirchhoff’s laws, you need to decide which loops to use and the direction of current flow through each loop. In analyzing the circuit in Example 10.7, the direction of current flow was chosen to be clockwise, from point a to point b. How would the results change if the direction of the current was chosen to be counterclockwise, from point b to point a?
Integrated Concepts (a) An immersion heater utilizing 120 V can raise the temperature of a 1.00 102 -g aluminum cup containing 350 g of water from 20.0°C to 95.0°C in 2.00 min. Find its resistance, assuming it is constant during the process. (b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.