Electric Circuits and Voltage Dividers Quiz
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Questions and Answers

What is the equation that represents the current in the given circuit?

  • I = R ΔV (correct)
  • I = 0.5R ΔV
  • I = R + R ΔV
  • I = 2R ΔV
  • In a voltage-divider circuit, what does the desired voltage represent?

  • Voltage drop across resistor R2 (correct)
  • Voltage drop across resistor R1
  • Voltage drop across resistor R
  • Total voltage of the circuit
  • Why does the voltage output of a voltage divider using a photoresistor depend on the amount of light striking the photoresistor?

  • Because resistors change their resistance with light intensity (correct)
  • Because photoresistors increase the battery capacity
  • Because voltage varies with light in a series circuit
  • Because light affects the current in the circuit
  • What is the resistance of a typical photoresistor when exposed to light?

    <p>400 Ω</p> Signup and view all the answers

    In the context of a voltage divider using a photoresistor, what does the voltage output depend on?

    <p>The amount of light striking the photoresistor</p> Signup and view all the answers

    What does the circuit shown in Figure 4 aim to demonstrate?

    <p>How to achieve a desired voltage using resistors</p> Signup and view all the answers

    If you only have a 9 V battery, how can you produce a potential difference of 5 V across a portion of an electric circuit?

    <p>By choosing the right combination of resistors</p> Signup and view all the answers

    What does a light meter, like the one shown in Figure 5, measure?

    <p>Illuminance based on light intensity</p> Signup and view all the answers

    What is the main function of a photoresistor used in electronic circuits like light meters?

    <p>To convert light intensity into resistance changes</p> Signup and view all the answers

    Why is it essential to choose resistors carefully in a voltage-divider circuit?

    <p>To achieve specific voltage levels across resistors</p> Signup and view all the answers

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