An electric kettle receives energy from two identical storage batteries before it is…
PHYSICS · Subjective · A Level · Physics · Measurements and their errors · Measurements and their errors
Problem
An electric kettle receives energy from two identical storage batteries before it is switched off. The first battery supplies 2.450 × 10³ J and the second supplies 3.75 × 10³ J. The total time for which the kettle was operated is measured to be 125.3 s.
(a) Calculate the total heat energy supplied to the kettle, expressing your answer to the correct number of significant figures.
(b) Determine the average power rating of the kettle using the energy obtained in (a) and state the final result with proper significant figures and unit.