Higher resistance of hair dryer

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SUMMARY

The discussion centers on determining the resistance of a hair dryer operating at two power settings: 840 W and 1320 W. It is established that the resistance is higher at the lower power setting of 840 W. To calculate the resistance, the relevant equation is P = V²/R, where P is power, V is voltage, and R is resistance. For a typical US hair dryer operating at 110 Vrms, the resistance can be calculated for both settings using this formula.

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Electrical engineering students, appliance designers, and anyone interested in understanding the electrical properties of household devices like hair dryers.

thschica
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A hair dryer has two settings: 840 W and 1320 W.
(a) At which setting do you expect the resistance to be higher?
840 W correct
After making a guess, determine the resistance at each setting.
(b) 840 W setting

(c) 1320 W setting


Homework Equations


I am not exactly sure what equation to use to determine the resistance of the two settings.


The Attempt at a Solution



i tried numerous equations such as R =pla but i can't figure it out
 
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I don't understand the "guess" part of the question, but whatever.

Use the equation for power as a function of voltage and resistance. If you are in the US, then wall power for a hair dryer would typically be 110Vrms.
 

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