Answer to Question #309355 in Optics for Chemistry

Question

A hair dryer is treated as a pure resistor. But because there are coils in the heating element and in the motor that drives the blower fan, a hair dryer also has inductance.

Qualitatively, does including an inductance increase or decrease the values of R, Irms, and P?

Answer 1

Answer

Let impedence is Z, resistance is R , inductance is L

Then we can write

$Z=\sqrt{R^2+(wL)^2}$

Which is clearly greater than R. So it will increase R.

Now current

$I_{rms}=\frac{V}{Z}$

As Z increases current decreases.

Power P decreases.