Question
One air fryer for sale takes in 239 Joules of energy to cook a meal and has an efficiency of 80%. How much energy is wasted when cooking this meal? (1 point)
220 J
191.2 J
478 J
47.8 J
220 J
191.2 J
478 J
47.8 J
Answers
GPT-4o mini
To find the amount of energy wasted when cooking the meal, we first need to calculate how much energy is actually used for cooking based on the efficiency of the air fryer.
The air fryer takes in 239 Joules of energy and operates at an efficiency of 80%. This means that only 80% of the energy is used effectively for cooking.
1. Calculate the useful energy used for cooking:
\[
\text{Useful energy} = \text{Input energy} \times \text{Efficiency} = 239 \, \text{J} \times 0.80 = 191.2 \, \text{J}
\]
2. Now we can find the wasted energy by subtracting the useful energy from the input energy:
\[
\text{Wasted energy} = \text{Input energy} - \text{Useful energy} = 239 \, \text{J} - 191.2 \, \text{J} = 47.8 \, \text{J}
\]
Thus, the amount of energy wasted when cooking this meal is **47.8 J**.
The air fryer takes in 239 Joules of energy and operates at an efficiency of 80%. This means that only 80% of the energy is used effectively for cooking.
1. Calculate the useful energy used for cooking:
\[
\text{Useful energy} = \text{Input energy} \times \text{Efficiency} = 239 \, \text{J} \times 0.80 = 191.2 \, \text{J}
\]
2. Now we can find the wasted energy by subtracting the useful energy from the input energy:
\[
\text{Wasted energy} = \text{Input energy} - \text{Useful energy} = 239 \, \text{J} - 191.2 \, \text{J} = 47.8 \, \text{J}
\]
Thus, the amount of energy wasted when cooking this meal is **47.8 J**.