Question

If $150{\text{J s}}^{-1}$ is required for an appliance to run, what is the power consumed by it, if it is operated at $240\text{V}$?

• A. $24\text{W}$
• B. $150\text{W}$
• C. $15\text{W}$
• D. $360\text{W}$

Answer 1

The correct option is B $150\text{W}$

Given,
Energy required per second = $150\text{J}$
Power = work done per unit time $\Rightarrow 1{\text{J s}}^{-1}=1\text{W}\Rightarrow 150{\text{J s}}^{-1}=150\text{W}$

(Irrespective of what is the operation power.)