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20 Nov 2019

Determine a) the current in the hair dryer and b) the powerconsumedby the lamp, when both are operating. Also find: c)the powerconsumed by the lamp when the hair dryer is turnedoff.

right under the lamp switch,thereshould be another resistor. Please include this withtheproblem.


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Jean Keeling
Jean KeelingLv2
1 Oct 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

5) A 1500 W electric hair dryer is designed to work in the UnitedStates, where the AC voltage is 120 V rms. What power is dissipatedin the hair dryer when it is plugged into a 240 V rms socket inEurope ?


10) A hair dryer has a power rating of 1200 W at 120 V rms. Assumethe hair dryer circuit contains only resistance.

a) What is the resistance of the heating element ?

b) What is the rms current drawn by the hair dryer ?

c) What is the maximum instantaneous power that the resistance mustwithstand ?

The figure shows the interior of a three-wayĀ incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with aĀ four-positionĀ switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1Ā and S2Ā both open), (2) switch S1Ā closed, (3) switch S2Ā closed, and (4) switches S1Ā and S2Ā both closed. The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input to the light bulb when (a) only switch S1Ā is closed, (b) only switch S2 is closed, and (c) both switches are closed? (d) What If? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

Figure

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I'm feeling really tiered and just can't think, please help if youcan. I might seem a bit lazy but I really don't feel well and thisis in for tomorrow :( :

1) with the aid of a sketch graph, describe how the resistance R ofa negative temperature coefficient (NTC) thermistor changes withtemperature T. (2marks) please explain how I should do thecurve/line of best fit for the graph thanks.

2) state how, and explain why, the resistance of the filament lampchanges as the p.d across it increases.

3) calculate the total resistance of the series combination of thefilament and the resistor.

4)calculate the internal resistance of the supply.

5) use fig 3.1 to calculate , for a p.d of 3v,
(I) the current in the lamp.
Answer:
I= V/R= 3/50=0.06 A

(ii) the power dissipated by the lamp.

6) suggest why the resistance of the lamp doesn't changesignificantly over the range of 0 to 2v.

7) the tungsten filament lamp is at room temperature when the p.dacross it is zero
I) state the resistance of the lamp at room temperature.


Thanks.

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