Question

A mobile phone is 35% efficient. Over half an hour 11 kJ of energy is transferred to the phone.

Calculate the amount of energy usefully transferred by the machine over half an hour.

Answer 1

Answer:-

• Energy Transferre=11KJ
• Efficiency=35%

☆Usefully transferred energy:-

$\\ \sf\longmapsto 35\%\:of 11$

$\\ \sf\longmapsto 35\%\times 11$

$\\ \sf\longmapsto \dfrac{35}{100}\times 11$

$\\ \sf\longmapsto \dfrac{385}{100}$

$\\ \sf\longmapsto 3.85KJ$

$\\ \sf\longmapsto 3850J$