Question

a cell phone takes 50 j total, but it only uses 48 j to function. what is the efficiency of the cell phone? ? % hint : efficiency = \frac{usable e}{total e} \cdot 100

Explanation:

Step1: Identify usable and total energy

Usable energy ($E_{usable}$) = 48 J, Total energy ($E_{total}$) = 50 J.

Step2: Apply efficiency formula

Efficiency = $\frac{E_{usable}}{E_{total}} \times 100$ = $\frac{48}{50} \times 100$

Step3: Calculate the value

$\frac{48}{50} \times 100$ = 48 × 2 = 96

Answer:

96