Answer:
80%
Explanation:
The thermal energy output by the oven is 800 J which is the useful energy that can be utilized for cooking.
The electrical energy input to the oven is 1000 J.
The efficiency of the oven =
(Useful energy output)/(Total energy input to the oven) x 100
[tex]=\frac{800}{1000}\times 100= 80\%[/tex]
Hence, the efficiency of the oven is 80%.
