Topic 3 (Energy Transformation & Electrical Energy)

A teacher is making coffee in an electric coffee maker.

The coffee maker has transformed electrical energy into what kind of energy?

• chemical

• heat

• light

• sound

What type of energy transformation occurs when a person hears a voice through a telephone?

• Light energy is transformed into sound energy.

• Heat energy is transformed into electrical energy.

• Electrical energy is transformed into sound energy.

• Electrical energy is transformed into mechanical energy.

Jerry & Kelsey created a circuit by connecting a battery to a small light bulb. Once they connected the wires, the light bulb turned on. This experiment demonstrated which energy change?

• Heat energy was changed into light energy.

• Light energy was changed into electrical energy.

• Electrical energy was changed into heat energy then changed into light energy.

• Electrical energy was changed into light energy and then light energy was changed back into electrical energy.

What type of energy is being transformed when a car's headlights turn on?

• electrical

• heat

• mechanical

• sound

A student asks her mother to help make her tea. They put a tea kettle on a hotplate and turn it on. After about 10 minutes, the tea kettle starts to whistle.

What energy transformations have taken place?

• sound to heat to light

• electric to sound to light

• electric to heat to sound

• electric to chemical to sound

A student plugs headphones into a computer to listen to a lesson online.

Which of the following best describes the energy transformation that occurs from the computer to the student's headphones?

• mechanical to light

• sound to electrical

• electrical to sound

• electrical to light

Sarah returns home at night and turns on her desk lamp. What kind of energy is being transformed into light?

• electrical

• heat

• motion

• sound

A student turns on an electric lamp. He notices that the energy from the electricity is transformed into 2 other forms?

What are these forms?

• light and heat

• light and sound

• light and motion

• light and electricity

What happens when an electric keyboard is played?

• Light energy transforms into electrical energy.

• Electrical energy is transformed into sound energy.

• Motion is transformed into electrical energy.

• Sound energy is transformed into motion.

A student turns on a computer screen. What energy transformation has taken place?

• light to electrical

• electrical to light

• sound to electrical

• electrical to sound