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\%* 11`

`\\ \sf\longmapsto (35)/(100)* 11`

`\\ \sf\longmapsto (385)/(100)`

`\\ \sf\longmapsto 3.85KJ`

`\\ \sf\longmapsto 3850J`