Concept explainers
(a)
The ratio of the power dissipated in the internal resistance to that of the load resistance.
(a)
Answer to Problem 86E
The ratio of the power dissipation in the internal resistance to the power dissipation in load is
Explanation of Solution
Write the expression for the power dissipation in the internal resistance.
Here,
Write the expression for the power dissipation across in the load.
Here,
Write the expression for the raio of the dissipated in the internal resistance to that of the load resistance.
Conclusion:
Substitute
Substitute
Substitute
Thus, the ratio of the power dissipation in the internal resistance to the power dissipation in load is
(b)
The ratio of the power dissipated in the internal resistance to that of the load resistance.
(b)
Answer to Problem 86E
The ratio of the power dissipation in the internal resistance to the power dissipation in load is
Explanation of Solution
Write the expression for the power dissipation in the internal resistance.
Write the expression for the power dissipation across in the load.
Write the expression for the raio of the dissipated in the internal resistance to that of the load resistance.
Conclusion:
Substitute
Substitute
Substitute
Thus, the ratio of the power dissipation in the internal resistance to the power dissipation in load is
Want to see more full solutions like this?
Chapter 20 Solutions
General Physics, 2nd Edition
- Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?arrow_forwardThe ignition circuit of an automobile is powered by a 12-V battery. How are we able generate large voltages with this power source?arrow_forwardConsider the circuit below. The battery has an emf of = 30.00 V and an internal resistance of r = 1,00 . (a) Find the equivalent resistance of the circuit and the current out of the battery. (b) Find the current through each resistor, (c) Find die potential drop across each resistor, (d) Find the power dissipated by each resistor, (e) Find the total power supplied by the batteries.arrow_forward
- Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?arrow_forwardA 0.50-W, 220- resistor carries the maximumcurrent possible without damaging the resistor. If the current were reduced to half the value, what would be the power consumed?arrow_forwardA short circuit in a 120-V appliance cord has a0.500- resistance. Calculate the temperature rise of the2.00 g of surrounding materials, assuming their specific heat capacity is 0.200cal/gC and that it takes 0.0500 sfor a circuit breaker to interrupt the current. Is this likely to be damaging?arrow_forward
- What is the internal resistance of a voltage source if its terminal voltage drops by 2.00 V when the current supplied increases by 5.00 A?arrow_forwardDuring surgery, a current as small as 20.0 µA applied directly to the heart may cause ventricular fibrillation. If the resistance of the exposed heart is 253 Ω, what is the smallest voltage (in mV) that poses this danger?arrow_forwardA circuit loop containing an external resistor of value R = 25.0 (ohms) is connected to a real battery with an internal emf = 20.0 V that has an internal resistance of R = 1.50 (ohms). How much power is generated by the power supply in Watts?arrow_forward
- What is the internal resistance of an automobile battery that has an emf of 12.0 V and a terminal voltage of 15.0 V while a current of 8.00 A is charging it?arrow_forwardA battery with EMF of 20 V and an internal resistance, r = 0.02 ohms is connected to the load resistances, R1 = 115 ohms, R2 = 147 ohms and R3 = 25 ohms. Determine the total current flowing in the circuit.arrow_forwardA device experiences a voltage drop of 4.0 V across it while a current of 4.0 mA flows through it. How much power does it dissipate?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
- College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning