Electrical Circuits and Resistance
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Questions and Answers

What is the primary function of a variable resistor in a circuit?

  • To provide a voltage drop
  • To limit current flow and provide a voltage drop (correct)
  • To increase the resistance
  • To increase the current flow

    • What is the relationship between the resistance of a resistor and the current flowing through it?

  • As the resistance increases, the current flowing through the resistor decreases (correct)
  • As the resistance increases, the current flowing through the resistor increases
  • As the resistance decreases, the current flowing through the resistor increases
  • The resistance of a resistor has no effect on the current flowing through it

    • What is an example of a household appliance that uses a variable resistor?

  • Refrigerator
  • Laptop
  • Dimmer switch (correct)
  • Toaster

    • If the third band is orange, what operation should be performed on the two-digit number to find the resistance?

    <p>Add three zeros</p> Signup and view all the answers

    What is the advantage of using the colour code to determine the resistance of a resistor?

    <p>It is faster and easier to use a key</p> Signup and view all the answers

    What is the primary function of a variable resistor in a circuit?

    <p>To regulate the voltage and current in the circuit</p> Signup and view all the answers

    What is the purpose of using a voltmeter and an ammeter in the experiment?

    <p>To measure the voltage and current in the circuit</p> Signup and view all the answers

    What is the relationship between voltage and current in a circuit with a variable resistor?

    <p>The voltage and current are inversely proportional</p> Signup and view all the answers

    What is a common household application of variable resistors?

    <p>Light dimmers</p> Signup and view all the answers

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