Question

If it takes 270,000 Joules of energy to power a flat iron for 4.5 minutes, what is the maximum power of the flat iron?A) 60,000 WB) 1000 WC) 1200 WD) 2700 W

Answer 1

Given:

The energy given to the flat iron is,

$E=270000\text{ J}$

The time for the energy is

$\begin{gathered} t=4.5\text{ minutes} \\ =4.5\times60\text{ s} \\ =270\text{ s} \end{gathered}$

To find:

The maximum power

Explanation:

The power of the flat iron is,

$\begin{gathered} P=\frac{E}{t} \\ =\frac{270000}{270} \\ =1000\text{ W} \end{gathered}$

Hence, the required power of the iron is 1000 W.