Question

A dual voltage/dual resistance AC hair dryer can be used with a 120 V or 230 V power supply. A switch allows the user to set the voltage (and hence the resistance) to the appropriate value. A tourist takes her 1530 W dual voltage hair dryer to Europe. She forgets to set the switch to 230 V. What power does the hair dryer consume before it starts to smoke?

____________ W

Answer 1

20607.42 Watts

Step-by-step explanation:

To find power, we use the formula:

`Power = V*A = V^2/r`

From the above equation it shows that power is proportional to the square of voltage.

Since it is of dual voltage and she forgets to set it at 230v. The hair dryer with rating of 1530 watts at 120 volts will consume

`1530*(230/120)^2 = 20607.42W`