Question

A typical electric hair dryer designed to operate on a 120-V AC household circuit is rated at a power consumption of 1500 watts. For calculating effective average values, we can treat 120-V AC as a DC current. a. What average current flows through the dryer? b. What is the resistance of the dryer?

Answer 1

(a). The average current flows through the dryer is 12.5 A

(b). The resistance of the dryer is 9.6 Ω

Step-by-step explanation:

Given that,

Voltage = 120 V

Power = 1500 W

(a). We need to calculate the average current flows through the dryer

Using formula of current

`P = IV`

`I=(P)/(V)`

Where, P = power

V = voltage

Put the value into the formula

`I=(1500)/(120)`

`I=12.5\ A`

(b). We need to calculate the resistance of the dryer

Using Ohm's law

`V = IR`

`R=(V)/(I)`

Where, I = current

Put the value into the formula

`R=(120)/(12.5)`

`R=9.6\ \Omega`

Hence, (a). The average current flows through the dryer is 12.5 A

(b). The resistance of the dryer is 9.6 Ω