Gr 9 NATURAL SCIENCES: CH 3.4 SUM Series and Parallel Circuits
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Questions and Answers

What is the primary characteristic of a series circuit?

  • Only one path for electric current to move through the circuit (correct)
  • Electric current flows from positive to negative terminal
  • Multiple paths for electric current to move through the circuit
  • Electric current flows from negative to positive terminal

    • What is the purpose of a voltmeter in an electric circuit?

  • To measure the total voltage of the circuit
  • To connect resistors in series
  • To measure electric current
  • To measure the potential difference between two points (correct)

    • How many cells and resistors are in the simple series circuit diagram shown?

  • 3 cells and 2 resistors
  • 1 cell and 2 resistors
  • 2 cells and 3 resistors (correct)
  • 4 cells and 4 resistors

    • What happens if you connect a voltmeter in series in a circuit?

    <p>There will not be a meaningful reading</p> Signup and view all the answers

    What is the difference in potential energy per charge between two points in an electric circuit called?

    <p>Potential difference (voltage)</p> Signup and view all the answers

    What instrument is used to measure the total current flowing through a circuit?

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

    How must an ammeter be connected in a circuit to measure the total current?

    <p>In series in the circuit</p> Signup and view all the answers

    What happens to the energy per charge when electrons pass through a resistor?

    <p>It decreases</p> Signup and view all the answers

    Why must a voltmeter be connected in parallel with the component being measured?

    <p>To measure the potential difference between two points</p> Signup and view all the answers

    What is the term for the flow of electrons from one point to another in an electric circuit?

    <p>Electric current</p> Signup and view all the answers

    What is the purpose of an ammeter?

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

    What happens to the total voltage when cells are connected in series?

    <p>It increases</p> Signup and view all the answers

    What is the effect of adding resistors in series?

    <p>The total resistance increases</p> Signup and view all the answers

    What is the current through each component in a series circuit?

    <p>The same</p> Signup and view all the answers

    What is a characteristic of a parallel circuit?

    <p>It provides more than one path for electric current</p> Signup and view all the answers

    What happens to the overall potential difference when cells are connected in parallel?

    <p>It remains the same</p> Signup and view all the answers

    What is an advantage of connecting cells in parallel?

    <p>Increased battery life</p> Signup and view all the answers

    What happens to the total resistance when resistors are added in parallel?

    <p>It decreases</p> Signup and view all the answers

    What is the total current in a parallel circuit?

    <p>The sum of the currents in each branch</p> Signup and view all the answers

    What is the potential difference across each branch in a parallel circuit?

    <p>The same as the potential difference across the battery</p> Signup and view all the answers

    What is the main reason for connecting a voltmeter in parallel with a component?

    <p>To measure the potential difference between two points in the circuit</p> Signup and view all the answers

    What happens to the current through each component in a series circuit?

    <p>It remains the same through all components</p> Signup and view all the answers

    Why is it not possible to measure potential difference using an ammeter?

    <p>Because an ammeter is used to measure current</p> Signup and view all the answers

    What is the term for the flow of electrons from one point to another in an electric circuit?

    <p>Electric current</p> Signup and view all the answers

    What is the purpose of an ammeter in a circuit?

    <p>To measure the total current flowing through the circuit</p> Signup and view all the answers

    What happens when electrons pass through a resistor in a circuit?

    <p>They lose energy per charge</p> Signup and view all the answers

    What is the requirement for measuring current in a circuit?

    <p>The ammeter must be connected in series</p> Signup and view all the answers

    What is the key characteristic of a series circuit?

    <p>Only one path for electric current</p> Signup and view all the answers

    What instrument is used to measure potential difference between two points in a circuit?

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

    Why is it necessary to have a single path for electric current in a series circuit?

    <p>To ensure the same current flows through all components</p> Signup and view all the answers

    What is the purpose of an ammeter's low resistance?

    <p>To not affect the current it is measuring</p> Signup and view all the answers

    When resistors are added in series, what happens to the total resistance?

    <p>It increases</p> Signup and view all the answers

    What happens to the current through each component in a series circuit?

    <p>It remains the same</p> Signup and view all the answers

    What is the total potential difference across the series circuit?

    <p>The sum of the potential differences across each component</p> Signup and view all the answers

    What happens when cells are connected in parallel?

    <p>The total voltage remains the same</p> Signup and view all the answers

    What is the advantage of connecting cells in parallel?

    <p>Increased battery life and stable voltage</p> Signup and view all the answers

    What happens to the total resistance when resistors are added in parallel?

    <p>It decreases</p> Signup and view all the answers

    What is the total current in a parallel circuit?

    <p>The sum of the currents in each branch</p> Signup and view all the answers

    What is the potential difference across each branch in a parallel circuit?

    <p>The same as the potential difference across the battery</p> Signup and view all the answers

    Why does the total resistance decrease when resistors are added in parallel?

    <p>More pathways allow for more current to flow through the circuit</p> Signup and view all the answers

    What is the reason for connecting a voltmeter in parallel with a component in a circuit?

    <p>To measure the potential difference between two points in the circuit</p> Signup and view all the answers

    What happens to the energy per charge of electrons when they pass through a cell in a circuit?

    <p>It increases</p> Signup and view all the answers

    What is the purpose of an ammeter in a circuit?

    <p>To measure the total current flowing through the circuit</p> Signup and view all the answers

    What is the characteristic of a series circuit that affects the current through each component?

    <p>The current through each component is the same</p> Signup and view all the answers

    What happens to the total current flowing through a circuit when cells are connected in series?

    <p>It remains the same</p> Signup and view all the answers

    Why can't a voltmeter be connected in series in a circuit?

    <p>It would not provide a meaningful reading</p> Signup and view all the answers

    What is the effect of connecting resistors in series on the total resistance of a circuit?

    <p>It increases the total resistance</p> Signup and view all the answers

    What is the purpose of using a single path for electric current in a series circuit?

    <p>To ensure the same current flows through all components</p> Signup and view all the answers

    What is the term for the difference in potential energy per charge between two points in an electric circuit?

    <p>Potential difference</p> Signup and view all the answers

    Why is it necessary to use a low-resistance ammeter in a circuit?

    <p>To ensure accurate measurement of current</p> Signup and view all the answers

    What is the main reason for connecting an ammeter in series with a component?

    <p>To measure the current through the component without affecting it</p> Signup and view all the answers

    When cells are connected in parallel, what happens to the overall potential difference?

    <p>It remains the same as the potential difference of a single cell</p> Signup and view all the answers

    What is the effect of adding resistors in parallel on the total resistance?

    <p>It decreases</p> Signup and view all the answers

    What is the current through each component in a series circuit?

    <p>The same in each component</p> Signup and view all the answers

    What is the total potential difference across a series circuit?

    <p>The sum of the potential differences across each component</p> Signup and view all the answers

    What happens to the total current when resistors are added in parallel?

    <p>It increases</p> Signup and view all the answers

    What is the analogy for adding resistors in parallel?

    <p>A school hall with two exit doors</p> Signup and view all the answers

    What is the formula for the total current in a parallel circuit?

    <p>I_total = I_1 + I_2 + I_3 + …</p> Signup and view all the answers

    What is the advantage of connecting cells in parallel?

    <p>Increased battery life and stable voltage</p> Signup and view all the answers

    What happens to the voltage across each resistor in a series circuit with equal resistors?

    <p>It divides equally among the resistors</p> Signup and view all the answers

    What is the reason why the voltage across each resistor in a series circuit with two equal resistors is the same?

    <p>Because the total voltage of the battery is divided equally between the two resistors.</p> Signup and view all the answers

    What is the effect of connecting cells in parallel on the overall potential difference of the circuit?

    <p>The overall potential difference remains the same as the potential difference of a single cell.</p> Signup and view all the answers

    What happens to the total resistance of a circuit when resistors are added in parallel?

    <p>The total resistance decreases.</p> Signup and view all the answers

    What is the primary reason for not connecting a voltmeter in series in a circuit?

    <p>Because it would not provide a meaningful reading due to the lack of potential difference between two points</p> Signup and view all the answers

    What is the relationship between the total current and the currents in each branch in a parallel circuit?

    <p>The total current is equal to the sum of the currents in each branch.</p> Signup and view all the answers

    What happens to the electric current flowing through each component in a series circuit?

    <p>It remains constant regardless of the number of components</p> Signup and view all the answers

    Why is it necessary to use a single path for electric current in a series circuit?

    <p>To ensure the same current flows through all the components</p> Signup and view all the answers

    What is the reason why the voltage across each branch in a parallel circuit is the same?

    <p>Because each branch has the same potential difference as the power source.</p> Signup and view all the answers

    What is the effect of adding resistors in series on the total potential difference of a circuit?

    <p>It increases the total potential difference of the circuit</p> Signup and view all the answers

    Why is an ammeter used to measure electric current in a circuit?

    <p>Because it has a low resistance that does not affect the circuit</p> Signup and view all the answers

    What happens to the total voltage when cells are connected in series?

    <p>It increases.</p> Signup and view all the answers

    What is the effect of adding resistors in parallel on the total current?

    <p>It increases.</p> Signup and view all the answers

    What is the current through each component in a parallel circuit?

    <p>The same in each component.</p> Signup and view all the answers

    Why does the total resistance decrease when resistors are added in parallel?

    <p>Because more pathways allow for more current to flow through the circuit.</p> Signup and view all the answers

    What is an advantage of connecting cells in parallel?

    <p>Increased battery life.</p> Signup and view all the answers

    What is the main reason why electric current flows through all components in a series circuit?

    <p>Because there is only one path for electric current to flow through</p> Signup and view all the answers

    What is the correct way to measure the potential difference across a resistor in a circuit?

    <p>By connecting a voltmeter in parallel with the resistor</p> Signup and view all the answers

    What happens to the current flowing through a circuit when an ammeter is connected in series?

    <p>The current remains the same because the ammeter has a low resistance</p> Signup and view all the answers

    Why is it necessary to use a single path for electric current in a series circuit?

    <p>To allow the current to flow through all components in the circuit</p> Signup and view all the answers

    What is the purpose of measuring the potential difference across a component in a circuit?

    <p>To determine the energy per charge lost or gained by electrons</p> Signup and view all the answers

    What is the main advantage of adding cells in parallel?

    <p>Increased battery life</p> Signup and view all the answers

    What happens to the total current when resistors are added in parallel?

    <p>It increases</p> Signup and view all the answers

    What is the characteristic of an ammeter?

    <p>Low resistance</p> Signup and view all the answers

    What is the relationship between the current and potential difference in a series circuit?

    <p>The current is inversely proportional to the potential difference</p> Signup and view all the answers

    What is the formula for the total current in a parallel circuit?

    <p>I_total = I_1 + I_2 + I_3</p> Signup and view all the answers

    What is the purpose of a voltmeter?

    <p>To measure the potential difference between two points</p> Signup and view all the answers

    What happens if you connect an ammeter in parallel in a circuit?

    <p>You get a meaningless reading of the total current</p> Signup and view all the answers

    What is the effect of connecting cells in series?

    <p>The total potential difference increases</p> Signup and view all the answers

    What is the characteristic of a series circuit?

    <p>There is only one path for electric current</p> Signup and view all the answers

    What happens to the energy per charge when electrons pass through a resistor?

    <p>It decreases</p> Signup and view all the answers

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