Energy and Power

Which two energy sources together provide more than 50% of the energy needs in the US?

• nuclear and natural gas

• oil and coal

• hydro power and oil

• natural gas and oil

Energy of motion is called

• elastic potential energy

• kinetic energy

• gravitational potential energy

• chemical energy

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The Law of Conservation of Energy states that energy cannot be created or destroyed, but energy can change

• its total mass

• its total volume

• from one form to another

• from one state of matter to another

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Which form of energy is being converted to electrical energy by the batteries in a flashlight?

• Chemical

• Nuclear

• Solar

• Sound

Which form of energy is produced when a rubber band vibrates?

• chemical

• light

• electrical

• sound

The unit for power is

• Calorie

• Work

• Watt

• Power

Which changes in energy are illustrated in the diagram?

• electrical to sound to light and mechanical

• sound to mechanical to light and electrical

• mechanical to light to sound and electrical

• light to electrical to mechanical and sound

As a candle burns, the chemical energy stored in the wax is transferred into

• Heat and Light

• Heat and Magnetism

• Electricity and Light

• Electricity and Magnetism

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Which factor contributes to global warming?

• increased use of solar-powered cars

• increased burning of fossil fuels

• better long-term weather forecasts

• changing distance between Earth and Sun

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Which of the following activities involves work done?

• An old man lying still on the floor

• A boy running around a stadium

• A girl holding a stack of books

• A baby crying