A kettle has a 55% energy efficiency. The input energy for the kettle is 378,000 J per boil. Calculate the amount of energy dissipated in 5 boils.
Energy used for one boil = (3.78 x 105 / 100) x 55Energy used for one boil = 2.079 x 105 J Energy lost per boil = 3.78 x 105 -2.079 x 105Energy lost per boil = 1.701 x 105Energy lost per 5 boils = (1.701 x 105) x 5Energy lost per 5 boils = 8.51 x 105 J, 3 s.f. (or 851 kJ)
RA
Related Physics GCSE answers
All answers ▸Why do we say that objects moving in a circle have acceleration even if their speed remains constant?
What are Balanced Forces?
How does a hydraulic jack work and how do I work out the pressures involved?
What is the reaction force? (eg from the ground or table)