Color LED Technology Quiz
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Questions and Answers

What happens when the voltage exceeds a turn-on threshold for a color LED?

  • Electricity stops flowing and brightness decreases
  • Electricity flows but brightness decreases
  • Electricity stops flowing but brightness increases
  • Electricity flows and brightness increases (correct)

    • What is the purpose of the internal resistor in a color LED?

  • To control the flow of electricity in the LED
  • To make the LED more energy efficient
  • To increase the brightness of the LED
  • To protect the LED from burning out due to high current (correct)

    • What is the function of a photoresistor?

  • To detect changes in air pressure
  • To change its resistance based on light intensity (correct)
  • To convert electricity into sound
  • To control or limit the current in a circuit

    • What do slide & press switches do when they are 'ON'?

    <p>Connect the wires in a circuit</p> Signup and view all the answers

    How does a speaker convert electricity into sound?

    <p>By making mechanical vibrations that create variations in air pressure</p> Signup and view all the answers

    What is the role of resistors in a circuit?

    <p>To control or limit the current in a circuit</p> Signup and view all the answers

    What is the movement of sub-atomic charged particles through a material due to electrical pressure?

    <p>Current</p> Signup and view all the answers

    What is the measure of how fast electricity is flowing in a wire?

    <p>Current</p> Signup and view all the answers

    What is the combination of voltage and current?

    <p>Power</p> Signup and view all the answers

    What component or circuit represents how much it resists the electrical pressure (voltage) and limits the flow of electric current?

    <p>Resistors</p> Signup and view all the answers

    What happens when resistance increases?

    <p>Less current flows</p> Signup and view all the answers

    What is the measure of how fast energy is moving through a wire?

    <p>Power</p> Signup and view all the answers

    Which component controls the flow of electricity like valves and faucets control water?

    <p>Transistors</p> Signup and view all the answers

    What causes vibrations that create variations in air pressure that your ears feel like sound from a speaker?

    <p>Plates stretching due to electrical signal</p> Signup and view all the answers

    What pushes electricity through a circuit, like a pump pushes water through pipes?

    <p>Power sources</p> Signup and view all the answers

    What is the measure of how fast electricity is flowing in a wire?

    <p>Current</p> Signup and view all the answers

    What is the purpose of the internal resistor in a color LED?

    <p>To protect the LED from burning out due to high current</p> Signup and view all the answers

    What is the role of resistors in a circuit?

    <p>To control or limit the current in a circuit</p> Signup and view all the answers

    What component controls the flow of electricity like valves and faucets control water?

    <p>Slide &amp; press switch</p> Signup and view all the answers

    How does a speaker convert electricity into sound?

    <p>By making mechanical vibrations</p> Signup and view all the answers

    What happens when resistance increases in a circuit?

    <p>The flow of electricity is controlled or limited</p> Signup and view all the answers

    What pushes electricity through a circuit, like a pump pushes water through pipes?

    <p>Voltage</p> Signup and view all the answers

    What is the measure of how fast electricity is flowing in a wire?

    <p>Current</p> Signup and view all the answers

    What pushes electricity through a circuit, like a pump pushes water through pipes?

    <p>Voltage</p> Signup and view all the answers

    Which component controls the flow of electricity like valves and faucets control water?

    <p>Switch</p> Signup and view all the answers

    What causes vibrations that create variations in air pressure that your ears feel like sound from a speaker?

    <p>Electrical signal</p> Signup and view all the answers

    What is the movement of sub-atomic charged particles through a material due to electrical pressure?

    <p>Electricity</p> Signup and view all the answers

    What is the combination of voltage and current?

    <p>Power</p> Signup and view all the answers

    What happens when resistance increases?

    <p>Less current flows</p> Signup and view all the answers

    What is the measure of how fast energy is moving through a wire?

    <p>Power</p> Signup and view all the answers

    What is the role of resistors in a circuit?

    <p>Limit the flow of electricity</p> Signup and view all the answers

    What happens when the voltage exceeds a turn-on threshold for a color LED?

    <p>The LED turns on</p> Signup and view all the answers

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