A simple ohmmeter is made by connecting a 2.50 V battery in series with a resistance R and an ammeter that reads from 0 to 1.00 mA, as shown in the figure. Resistance R is adjusted so that when the clip leads are shorted together, the meter deflects to its full-scale value of 1.00 mA. If the ammeter has a resistance of 15.6 0 and the internal resistance of the battery is negligible, what is the value of R?

A simple ohmmeter is made by connecting a 2.50 V battery in series with a resistance R and an ammeter that reads from 0 to 1.00 mA, as shown in the figure. Resistance R is adjusted so that when the clip leads are shorted together, the meter deflects to its full-scale value of 1.00 mA. If the ammeter has a resistance of 15.6 0 and the internal resistance of the battery is negligible, what is the value of R?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 10CQ: Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew =...

See similar textbooks

Similar questions

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?
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?
Explain why R=R0(1 + a?T) for the temperature variation of the resistance R of an object is not as accurate as P=P0(1 + a?T) which gives the temperature variation of resistivity P.
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.
A child's electronic toy is supplied by three 1.58-V alkaline cells having internal resistances of 0.0200 inseries with a 1.53-V carbon-zinc dry cell having a 0.100- internal resistance. The load resistance is 10.0 . (a) Draw a circuit diagram of the toy and itsbatteries, (b) What current flows? (c) How much power is supplied to the load? (d) What is the internal resistance of the dry cell if it goes bad, resulting in only 0.500 W being supplied to the load?
Calculate the equivalent resistance between points P and Q of the electrical network shown in Figure P29.80.
A simple ohmmeter is made by connecting a 2.50 V battery in series with a resistance R and an ammeter that reads from 0 to 1.00 mA, as shown in the figure. Resistance R is adjusted so that when the clip leads are shorted together, the meter deflects to its full-scale value of 1.00 mA. What external resistance across the leads results in a deflection of (a) 9.00%, (b) 54.9%, and (c)85.7% of full scale? (d) If the ammeter has a resistance of 15.6 0 and the internal resistance of the battery is negligible, what is the value of R? Ef 0-1.00) mA R
(a) Six lead-acid type of secondary cells each of emf 2.0 V and internal resistance 0.015 2 are joined in series to provide a supply to a resistance of 8.5 N. What are the current drawn from the supply and its terminal voltage? (b) A secondary cell after long use has an emf of 1.9 V and a large internal resistance of 380 N. What maximum current can be drawn from the cell? Could the cell drive the starting motor of a car?
Tha battery with unknown emf and internal resistance r is supplying electrical power of 18 mw to a single resistor of unknown resistance R. If the total current in the circuit is 3 mA, determine the terminal voltage of the battery. O 6 mv O 54 v O 54 mv O 6 v
The RC charging circuit in a camera flash unit has a voltage source of 295 V and a capacitance of 126 µF. HINT Apply the expression q = Q(1 - e-t/RC). Click the hint button again to remove this hint. (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 14.2 s. (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.14 ms. A
A flash unit for a camera has a capacitance of 1300 µF. What resistance is needed in this RC circuit if the flash is to charge to 90% of its full charge in 22 s ?
When a R = 88.4 Q resistor is connected across a 11.2 V battery, a current of 113.3 mA flows. What is the internal resistance of the battery and Terminal voltage of the battery ? (1) E(MF) Rexternal extermal Rintemal (a) internal resistance of the battery(in 2) = (b) Terminal voltage of the battery in V = Battery