QUESTIONS

• What does it mean if a component has polarity?

  it can only be connected in a circuit in one direction
• Which input component detects sound?

  Microphones
• Why are LEDs becoming a much more popular light source than traditional lamps?

  they use up less energy
• Which household appliances and electronic devices use the most power?

  • Refrigerators
  • air conditioners
  • washing machines