Question

ray creates an energy transfer diagram for a hair dryer. however, the diagram contains an error that could be corrected in several different ways. which of these changes would make the diagram error - free? check all that apply. kinetic energy 125 j sound energy 150 j electrical energy 750 j thermal energy 550 j reducing the amount of thermal energy to 475 j increasing the amount of electrical energy to 825 j increasing the amount of sound energy to 225 j reducing the amount of kinetic energy to 50 j reducing the amount of electrical energy to 675 j

Explanation:

Step1: Recall energy - conservation principle

In an energy - transfer process, the total output energy should not exceed the input energy. The sum of kinetic, sound, and thermal energies in the diagram is \(125 + 150+550=825\) J, which is greater than the input electrical energy of 750 J.

Step2: Analyze each option

• Reducing thermal energy to 475 J: The new sum of output energies is \(125 + 150+475 = 750\) J, equal to input electrical energy.
• Increasing electrical energy to 825 J: Then the total output energy of 825 J is equal to the input electrical energy.
• Increasing sound energy to 225 J: The sum of output energies becomes \(125+225 + 550=900\) J, greater than input electrical energy.
• Reducing kinetic energy to 50 J: The sum of output energies is \(50+150 + 550=750\) J, but this still doesn't account for the initial error in a proper way as the original error is due to total output > input.
• Reducing electrical energy to 675 J: The sum of output energies (825 J) is still greater than the input electrical energy.

Answer:

• reducing the amount of thermal energy to 475 J
• increasing the amount of electrical energy to 825 J