Halogen Bulbs
Halogen bulbs have some differences from standard incandescent lightbulbs. They are generally smaller, the filament runs at a higher temperature, and they have a quartz (rather than glass) envelope. They may also operate at lower voltage. Consider a 12 V, 50 W halogen bulb for use in a desk lamp. The lamp plugs into a 120 V, 60 Hz outlet, and it has a transformer in its base.
Suppose the transformer in the base of the lamp has 500 turns of wire on its primary coil. How many turns are on the secondary coil?
A. 50
B. 160
C. 500
D. 5000
Want to see the full answer?
Check out a sample textbook solutionChapter 26 Solutions
Student Workbook for College Physics: A Strategic Approach Volume 1 (Chs 1-16)
Additional Science Textbook Solutions
Conceptual Integrated Science
Tutorials in Introductory Physics
Introduction to Electrodynamics
Physics for Scientists and Engineers with Modern Physics
University Physics (14th Edition)
Essential University Physics: Volume 1 (3rd Edition)
- (a) The plug-in transformer for a laptop computer puts out 7.50 V and can supply a maximum current of 2.00 A. What is the maximum input current if the input voltage is 240 V? Assume 100% ef?ciency. (b) If the actual efficiency is less man 100%, would the input current need to be greater or smaller? Explain.arrow_forwardConstruct Your Own Problem Consider a double transformer to be used to create very large voltages. The device consists of two stages. The first is a transformer that produces a much larger output voltage than its input. The Output of the first transformer is used as input to a second transformer that further increases the voltage. Construct a problem in which you calculate the output voltage of the final stage based on the input voltage of the first Stage and the number of turns or loops in bath parts of both transformers (four coils in all). Also calculate the maximum output current of the final stage based on the input current. Discuss the possibility of power losses in the devices and the effect on the output current and power.arrow_forward(a) What is the resistance of a 220-V AC short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the average power be if the voltage was 120 V AC?arrow_forward
- Neon signs require 12-kV for their operation. A transformer is to be used to change the voltage from 220-V (rms) ac to 12-kV (rms) ac. What must the ratio be of turns in the secondary winding to the turns in the primary winding? (b) What is the maximum rms current the neon lamps can draw if the fuse in the primary winding goes off at 0.5 A? (C) How much power is used by the neon sign when it is drawing the maximum current allowed by the fuse in the primary winding?arrow_forwardWhat is the peak current through a 500-W room heater that operates on 120-V AC power?arrow_forward(a) What is the resistance of a 220-V ac short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the voltage were 120 V ac?arrow_forward
- While taking a bath, a person touches the metal case of a radio. The path through the person to the drainpipe and ground has a resistance of 4000 . What is the smallest voltage on the case of the radio that could cause ventricular fibrillation?arrow_forward(a) What current flows when a 60.0 Hz, 480 V AC source is connected to a 0.250 (F capacitor? (b) What would the current be at 25.0 kHz?arrow_forwardCertain heavy industrial equipment uses AC power that has a peak voltage of 679 V. What is the rms voltage?arrow_forward
- The power rating of a resistor used in ac circuits refers to the maximum average power dissipated in the resistor. How does this compare with the maximum instantaneous power dissipated in the resistor?arrow_forwardWhy is the power dissipated by a closed switch, such as in Figure 21.43, small?arrow_forwardTwo different electrical devices have the same power consumption, but one is meant to be operated on 12G-V AC and the other on 240-V AC. (a) What is the ratio of their resistances? (b) What is the ratio of their currents? (c) Assuming its resistance is unaffected, by what factor will the power increase if a 120-V AC device is connected to 240-V AC?arrow_forward
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning