Capacitors, Efficiency and Alternate Energy Sources

What is a dielectric material?

• A material that does not conduct electricity

• A material that allows electricity to flow quickly

• A material that stores electrons

What is a capacitor?

• an electrical component that draws energy from a battery and stores the energy

• an electrical component that produces energy from a chemical reaction

• an electrical component that can be used to slowly power a phone.

What the five main alternate energy sources

• Wind, Fire, Ice, Earth, Water

• Wind, Solar, Biomass, Hydro, Nuclear

• Volcanoes, Lightning, Earthquakes, Floods, Tornadoes

If a machines wastes 50% of its energy, then what is its efficiency?

• 40%

• 150%

• 75%

• 50%

If a light bulb uses 500J of energy to light up and the total energy input was 750J. What is the energy wasted?

• 1250J

• 250J

• 500J

• 750J

If a machine is 40% efficient than how much waste does it have?

• 140%

• 60%

• 20%

• 30%

Input 1250J Output 800J

What is the efficiency?

• 46%

• 64%

• 36%

What is a good use for a capacitor?

• A camera Flash

• Charging a battery

• Powering a refrigerator

A capacitor releases its stored energy very slowly.

• True

• False