Energy and Efficiency Quiz

What is the definition of energy?

• The ability to do work

• The ability to create matter

• The ability to generate heat

• The ability to produce light

Which equation is used to calculate efficiency?

• (useful energy out ÷ total energy in) × 100

• power = energy ÷ time

• work done = force × distance

• energy = mass × speed

How is power calculated according to the table?

• power = energy ÷ time

• power = force × distance

• power = mass × acceleration

• power = work ÷ time

What is the formula for work done?

• work done = force × distance

• work done = energy ÷ time

• work done = mass × velocity

• work done = power × time

In the example provided, what is the efficiency of the light bulb?

• 20%

• 40%

• 60%

• 80%

If a device has a useful energy output of 50 watt hours and a total energy input of 250 watt hours, what is its efficiency?

• 20%

• 25%

• 30%

• 35%

Which of the following is NOT a property listed in the table?

• Efficiency

• Power

• Work done

• Velocity

What is the unit of energy used in the example calculation?

• Watt hours

• Joules

• Kilowatt hours

• Calories