1. For any functioning electrical device, the electrical energy that flows from the power source into the device is called the:
- A. output
- B. input
- C. conversion
- D. circuit
2. When a television is on, it produces light and sound. According to the principle of energy conversion, what is happening to the electrical energy it uses?
- A. It is being destroyed by the screen and speakers.
- B. It is being changed into light, sound, and heat energy.
- C. It is being stored inside the television for later.
- D. It is being created by the television's internal power supply.
3. In the context of an electrical device, what is the best description of "energy conversion"?
- A. The process of creating new electrical energy from a power source.
- B. The process of changing electrical energy into another form, like motion or sound.
- C. The movement of electricity through wires to reach a device.
- D. The method of storing electrical energy inside the device for later use.
4. What is the primary role of an electrical device, such as a blender or a speaker, when it is connected to a power source?
- A. To generate the initial electricity for the circuit.
- B. To act as a safety switch that stops the flow of electricity.
- C. To store all the electrical energy that flows from the power source.
- D. To take in electrical energy and change it into a different, useful form of energy.
5. A student plugs in an electric fan, and the blades begin to spin, creating a breeze. What is the main energy conversion happening in the fan?
- A. Motion to electrical
- B. Electrical to motion
- C. Heat to electrical
- D. Electrical to sound
6. When an electric fan is operating, which of the following is a primary energy output?
- A. The movement of the blades
- B. The color of the fan's housing
- C. The length of the electrical cord
- D. The material the on/off switch is made of
7. A phone screen lights up and makes a sound when it receives a notification. These observations are evidence of what?
- A. The phone's case color
- B. The phone's physical weight
- C. Energy being used by the phone
- D. The manufacturing date of the phone
8. Hearing a humming noise from a running refrigerator is direct evidence that the device is producing which form of energy?
- A. Sound energy
- B. Light energy
- C. Chemical energy
- D. Electrical energy
9. A student plugs in a speaker and music begins to play. What is the primary output that provides evidence of energy use in this scenario?
- A. The shape of the speaker.
- B. The sound of the music.
- C. The length of the speaker wire.
- D. The button used to turn the volume up.
10. Which of the following is NOT an energy output produced by a working electrical device?
- A. The glow from a television screen.
- B. The brand name printed on the device.
- C. The warm air blown by a space heater.
- D. The beeping sound from a finished dishwasher cycle.