How is Energy Transferred by Electric Currents?

What is an electric current?

• a mix of heat and sound

• a collision of objects

• a group of magnets

• a flow of electric charges

To transfer energy carried by light to an electric current, you need a ______.

• turbine

• generator

• battery

• solar cell

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A device that uses an electric current to produce motion is called a _______.

• Motor

• Turbine

• Solar Cell

• Generator

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In a speaker, an electric current moves a cone-shaped part, which

• Turns a motor

• Transfers energy to the air

• Recharges a battery

• Light a filament

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Which of the following is true of energy carried by sound, light, and heat?

• The energy is always stored

• The energy does not transfer

• The energy is conserved

• The energy cannot be produced by an electric current

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Jeremiah receives this remote control car as a gift. Based on evidence in the photo, where does the car’s motor MOST LIKELY get its energy from?

• Steam

• Batteries

• Solar Cells

• Electrical Outlets

Emmanuel is filling a pot of water to make pasta. Emmanuel’s grandmother turns on the burner. Look at the photograph. Which of the following BEST explains how the pan warms up?

• The energy lost by the electric current becomes light that warms the pan

• The energy lost by the electric current becomes light that cools the pan.

• The energy lost by electric current becomes heat that warms the pan

• The energy lost by the electric current becomes heat that cools the pan.

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Alejandra’s home has solar panels on the roof, as shown below. When it is sunny, the energy from the solar panels heats up the water tank. It has been cloudy for two weeks straight. Which of the following is MOST LIKELY to happen?

• The microwave will not heat food.

• The water in the shower will be cold

• The lightbulb in the lamp will not give off light

• The washing machine will not start

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The electricity bill at the Silverman’s apartment was very high last month. Noah decided to conduct an investigation in his home to see why. First, he got out a notebook and went around the apartment writing down sources that used electricity. Then, every day for four days he noted if his family had used the sources. He recorded his data in the table below. Based on the evidence in the table, on which day did the Silvermans use the most energy?

• Sunday

• Monday

• Tuesday

• Wednesday

Which claim is BEST supported by the evidence in the table?

• People can save energy by turning on sources they need.

• People can create energy by turning off sources they need.

• People can reduce their energy use by turning off sources they do not need.

• People can increase their energy use by turning off sources they do not need.

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