Atomic age

What is the efficiency of a solar cell if 1000 J of solar energy hits the cell and 200 J are converted into electrical energy?

• 10%

• 20%

• 30%

• 40%

What is potential energy?

• moving energy

• stored energy

• renewable energy

• non renewable energy

What is kinetic energy?

• moving energy

• potential energy

• stored energy

• renewable energy

Electricity can be obtained from different energy resources. Which energy resource is used to obtain electricity without producing heat to boil water?

• coal

• geothermal

• hydroelectric

• nuclear

Besides coal and natural gas, another fossil fuel  is

• petroleum/oil
• biomass
• electricity
• uranium

Fossil fuels are nonrenewable  resources because they

• take millions of years to form
• are easily replaced
• are in high demand
• don't pollute the air

The source of energy that comes from the intense heat beneath Earth's surface is

• nuclear fusion
• geothermal energy
• solar energy
• chemical energy

All of the following are renewable except

• uranium
• solar
• hydropower
• food crops (biomass)

The original source of energy for fossil fuels comes from the

• sun
• Earth's crust
• geothermal energy
• oceans

Moving water, tides, and dams are examples of

• hydropower
• fossil fuels
• geothermal energy
• radiant energy