Question

A 12 ohm hair dryer is plugged into a 240 V power supply. What is the current?

Answer 1

Given,

The resistance of the hairdryer, R=12 Ω

The voltage of the power supply, V=240 V

From Ohm's law,

`V=IR`

Where I is the current.

On substituting the known values,

`\begin{gathered} 240=I*12 \\ \Rightarrow I=(240)/(12) \\ =20\text{ A} \end{gathered}`

Thus the current is 20 A.