Question

A fuel cell generates 50 W of electricity from the fuel provided. If this corresponds to an efficiency of 40%, the total energy wasted in 1 minute is _____________ J ?

Answer 1

Given in the question :-

It generate 50 W of electricity is provided.

Total energy wasted in 1 minute = ?

Let fuel cell generate P W if efficiency is 100%

Therefore we know the formula ,

P × 40/100 = 50

P = 5000/40

P = 125 J/sec.

∴ In 1 sec (125 -50) Joules are wasted.

So in 1 minute = 75 × 60 joules are wasted

= 75 × 60

= 4500 Joules.

So energy wasted in 1 minute= 4500 Joules

Hope it Helps