SOL 5.9 Energy Resources

Which are ways to conserve or save energy?

• Sleep with the television turned on.  Turn off the fans when leaving the room.

• Leaving the air conditioner on when leaving the room.  Place the computer in sleep mode when it is not in use. 

• Keep the laptop plugged in when it is 100% charged.  Turn off the air conditioner when leaving home. 

• Turn off outdoor lights during the daytime.  Wash clothes in the coolest water that will get them clean.

Answer explanation

The correct choices, 'Turn off outdoor lights during the daytime' and 'Wash clothes in the coolest water that will get them clean,' are effective ways to conserve energy by reducing unnecessary electricity use.

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NGSS.MS-PS3-3

Which of these technologies is a source of renewable energy?

• solar cell

• fuel cell

• generator

• nuclear power plant

Answer explanation

A solar cell converts sunlight into electricity, making it a renewable energy source. In contrast, fuel cells and nuclear power plants rely on non-renewable resources, while generators typically use fossil fuels.

A pot of water is heated by a stove. The temperature of water is increasing by what type of energy?

• solar

• thermal

• light

• electrical

Answer explanation

The water's temperature increases due to thermal energy, which is the energy associated with the heat transfer from the stove to the water. This process raises the water's temperature.

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NGSS.MS-PS1-4

A cashier at the grocery store pushes a button and the conveyor belt begins to move the items on it towards them. What type of energy most likely moves the belt?

• electrical

• solar

• thermal

• mechanical

Answer explanation

The conveyor belt is powered by a motor that converts electrical energy into mechanical energy, which moves the belt. Therefore, the type of energy that most likely moves the belt is mechanical.

Which two are renewable energy sources?

• wind

• natural gas

• coal

• sunlight

Answer explanation

Wind and sunlight are renewable energy sources because they are naturally replenished. In contrast, natural gas and coal are fossil fuels that deplete over time and contribute to environmental issues.

Which two are nonrenewable energy sources?

• wind

• coal

• natural gas

• sunlight

Answer explanation

Coal and natural gas are nonrenewable energy sources because they are finite resources formed over millions of years. In contrast, wind and sunlight are renewable, as they can be replenished naturally.

What is renewable energy?

• energy that can not run out (can make more in a reasonable amount of time)

• energy that can run out (takes millions of years to make more)

Answer explanation

Renewable energy refers to energy sources that can be replenished naturally in a short time frame, such as solar or wind power. This makes it sustainable and ensures it does not run out, unlike non-renewable sources that take millions of years to form.

What is nonrenewable energy?

• energy that can not run out

• energy that can run out

Answer explanation

Nonrenewable energy refers to energy sources that can run out, such as fossil fuels. Unlike renewable energy, which is replenished naturally, nonrenewable sources are finite and will eventually be depleted.

Which one of these is using nonrenewable energy?

• a power plant that burns coal

• a windmill on a farm

• a dam on a river

• a power plant that turns dried grasses

Answer explanation

A power plant that burns coal uses nonrenewable energy because coal is a fossil fuel that cannot be replenished in a short time. In contrast, windmills and dams utilize renewable energy sources.

Fossil fuels are nonrenewable because-

• they have turned into solid rock

• are expensive to remove from rock

• take a long period of time to form

• are located deep within the Earth's crust

Answer explanation

Fossil fuels are considered nonrenewable because they take a long period of time to form, often millions of years, making their replenishment rate much slower than the rate at which we consume them.