A three-way lightbulb can produce 50 W, 100 W, or 150 W,at 120 V. Such a bulb contains two filaments that can beconnected to the 120 V individually or in parallel (Fig. 19–74).(a) Describe how theconnections to thetwo filaments aremade to give each ofthe three wattages.(b) What must be theresistance of eachfilament?FIGURE 19–74Problem 68.

Given: A three-way light bulb can produce 50W, 100W and 150W at 120 V.

Answered: A three-way lightbulb can produce 50 W,…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

What minimum number of 75-W lightbulbs must be connected in parallel to a single 120-V household circuit to trip a 30-A circuit breaker?
17-2.A given copper wire has a resistance of 5.18 Ω at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.77 Ω at 20.0°C. At what temperature will the two wires have the same resistance?
*20. "Two cylindrical rods, one copper and the other iron, are iden- tical in lengths and cross-sectional areas. They are joined end to end to form one long rod. A 12-V battery is connected across the free ends of the copper-iron rod. What is the voltage between the ends of the copper rod?
consider a portable electric blanket that runs on a 4,5 V battery. ıf you use copper wire with a 0,75 mm diameteras the heating element, how long should the wire be (in units of meters) if you want to generate 20 W of heating power ?(take the resistivity of the copper wire as p = 1,7 * 10-8 ohm*m)
The circuit shown below can be used to measure the resistance of a platinum resistance thermometer (PRT). AB is a uniform resistance wire of length 1.00 m and C is a sliding contact on this wire. A standard resistor R is included in the circuit. The position of C is adjusted until the voltmeter V reads zero. (ii) The PRT consists of 9.00 m of wire of diameter 8.4 × 10-2 mm. The voltmeter reads 0 V when l1 = 0.422 m. If the standard resistor, R, has a resistance of 220 Ω, what is the resistivity of platinum? Show that you have checked that the value for the resistivity and its unit are sensible.
(a) A 20.0 V battery supplies 1.5 A to a 12.0 N resistor. Calculate the (i) teminal voltage of the battery, (1) intemal resistance of the battery, (ii) power generated by the battery, and (iv) power delivered to the intenal resistor.
The terminal voltage of a battery falls from 12v to 10v when an 8-ohm resistor is connected across its terminals. What is the equivalent resistance (internal resistance) of the battery?
Two different 12-V automobile batteries on a store shelf are rated at 600 and 850 “cold cranking amps.” Which has the smallest internal resistance?
Three resistors are connected to a 4-V battery, 10,25,20. The internal resistance of the battery is negligible. (a) What is the current through the 15-Ω resistance? A(b) Does this same current flow through the 25-Ω resistance? YesNo (c) What is the voltage difference across the 20-Ω resistance? V
If you try and measure the voltage of a battery with a voltmeter connected in series, you won't get a completely accurate measurement because of the internal resistance of the battery. To see how large this effect is, consider trying to measure the terminal voltage of a 1.585 V alkaline cell having an internal resistance of 49 Ω by placing a 0.85 kΩ voltmeter across its terminals. What current flows in A?
(a) Find the voltage drop (in V) in an extension cord having a 0.0650 Ω resistance and through which 5.45 A is flowing. V (b) A cheaper cord utilizes thinner wire and has a resistance of 0.340 Ω. What is the voltage drop (in V) in it when 5.45 A flows?V (c)Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance?
- A 100 W lightbulb has a resistance of about 12 when cold (20 deg * C) and 156 when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0045(C) ^ - 1.

Recommended textbooks for you

College Physics

Physics

ISBN:

9781305952300

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

University Physics (14th Edition)

Physics

ISBN:

9780133969290

Author:

Hugh D. Young, Roger A. Freedman

Publisher:

PEARSON

Introduction To Quantum Mechanics

Physics

ISBN:

9781107189638

Author:

Griffiths, David J., Schroeter, Darrell F.

Publisher:

Cambridge University Press

College Physics

Physics

ISBN:

9781305952300

Author:

Raymond A. Serway, Chris Vuille

Publisher:

Cengage Learning

University Physics (14th Edition)

Physics

ISBN:

9780133969290

Author:

Hugh D. Young, Roger A. Freedman

Publisher:

PEARSON

Introduction To Quantum Mechanics

Physics

ISBN:

9781107189638

Author:

Griffiths, David J., Schroeter, Darrell F.

Publisher:

Cambridge University Press

Physics for Scientists and Engineers

Physics

ISBN:

9781337553278

Author:

Raymond A. Serway, John W. Jewett

Publisher:

Cengage Learning

Lecture- Tutorials for Introductory Astronomy

Physics

ISBN:

9780321820464

Author:

Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden

Publisher:

Addison-Wesley

College Physics: A Strategic Approach (4th Editio…

Physics

ISBN:

9780134609034

Author:

Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher:

PEARSON

SEE MORE TEXTBOOKS