CH 7: Internal resistance, series and parallel networks
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Questions and Answers

In a real-life circuit, what factor affects the current and voltage distribution?

  • The internal resistance of the battery or cell
  • The external resistance of the circuit components
  • The electromotive force (emf) of the battery
  • All of the above (correct)

    • What is the relationship between the actual voltage provided by a battery and its electromotive force (emf)?

  • The actual voltage is always equal to the emf
  • The actual voltage is greater than the emf
  • The actual voltage and emf are unrelated
  • The actual voltage is less than the emf due to the voltage drop across the internal resistance (correct)

    • In a series circuit, which statement is true?

  • The same current flows through each component, but different potential drops occur across each resistor
  • The total resistance is the sum of individual resistances
  • Both a and c (correct)
  • Different currents flow through each component, but the same potential drop occurs across each resistor

    • What is the characteristic of a parallel circuit?

    <p>The same potential difference exists across each component, but different currents flow through each resistor</p> Signup and view all the answers

    What is the purpose of understanding the internal resistance of a battery or cell?

    <p>To analyze the current and voltage distribution in circuits with external resistors</p> Signup and view all the answers

    For a series circuit, which formula is used to calculate the voltage drop across each resistor?

    <p>$V = IR$</p> Signup and view all the answers

    In a parallel circuit, how is the total equivalent resistance calculated?

    <p>$\frac{1}{R_{total}} = \frac{1}{R_1} + \frac{1}{R_2} + \ldots$</p> Signup and view all the answers

    What is the effective voltage across an external load when considering the internal resistance of a battery?

    <p>$V_{load} = \varepsilon - Ir$</p> Signup and view all the answers

    Which formula can be used to calculate the power dissipated in a circuit?

    <p>All of the above</p> Signup and view all the answers

    In a practical application, how does the internal resistance of a battery affect its performance?

    <p>It reduces the actual output voltage of the battery</p> Signup and view all the answers

    If a battery has an emf of 12V and an internal resistance of 0.5Ω, what is the terminal voltage when delivering a current of 2A?

    <p>10V</p> Signup and view all the answers

    In a series circuit with two resistors of 3Ω and 6Ω, what is the ratio of the voltage drops across the resistors?

    <p>1:2</p> Signup and view all the answers

    If two resistors of 4Ω and 8Ω are connected in parallel, what is the equivalent resistance?

    <p>2.67Ω</p> Signup and view all the answers

    What happens to the total resistance in a parallel circuit as the number of parallel branches increases?

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

    If a battery has an emf of 9V and an internal resistance of 1Ω, what is the maximum current it can deliver to a short circuit?

    <p>9A</p> Signup and view all the answers

    In a series circuit with three resistors of 2Ω, 3Ω, and 5Ω, what is the potential difference across the 3Ω resistor if the total voltage is 10V?

    <p>3V</p> Signup and view all the answers

    What is the effect of increasing the internal resistance of a battery on its terminal voltage?

    <p>Terminal voltage decreases</p> Signup and view all the answers

    In a parallel circuit with two resistors of 6Ω and 9Ω, what is the current through the 6Ω resistor if the total current is 3A?

    <p>1.5A</p> Signup and view all the answers

    If a battery has an emf of 12V and an internal resistance of 0.2Ω, what is the maximum power it can deliver to an external load?

    <p>720W</p> Signup and view all the answers

    In a series circuit with two resistors of 4Ω and 8Ω, what is the ratio of the power dissipated in the resistors?

    <p>1:2</p> Signup and view all the answers

    What is the formula used to calculate the total resistance in a series circuit?

    <p>$R_\text{total} = R_1 + R_2 + \dots + R_n$</p> Signup and view all the answers

    Which formula is used to calculate the power dissipated in a circuit, given the voltage and current?

    <p>All of the above</p> Signup and view all the answers

    What is the formula used to calculate the effective voltage across an external load when considering the internal resistance of a battery?

    <p>$V_\text{load} = \epsilon - IR_\text{internal}$</p> Signup and view all the answers

    How is the total equivalent resistance calculated in a parallel circuit?

    <p>$1/R_\text{total} = 1/R_1 + 1/R_2 + \dots + 1/R_n$</p> Signup and view all the answers

    What is the effect of internal resistance on the performance of a battery in a high-current load application?

    <p>It reduces the actual output voltage of the battery.</p> Signup and view all the answers

    What is the characteristic of a series circuit that distinguishes it from a parallel circuit?

    <p>Both a and b</p> Signup and view all the answers

    Which of the following is not a formula used to calculate power in a circuit?

    <p>$P = V / I$</p> Signup and view all the answers

    In a practical application, how does the internal resistance of a battery affect the current and voltage distribution in the circuit?

    <p>It decreases both the current and voltage in the circuit.</p> Signup and view all the answers

    What is the relationship between the actual voltage provided by a battery and its electromotive force (emf)?

    <p>The actual voltage is either greater or less than the emf, depending on the internal resistance.</p> Signup and view all the answers

    What is the purpose of understanding the internal resistance of a battery or cell in a circuit?

    <p>All of the above</p> Signup and view all the answers

    What is the primary factor that affects the current and voltage distribution in circuits when batteries and cells are not ideal voltage sources?

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

    In a series circuit, what is the relationship between the current flowing through each component and the potential drops across individual resistors?

    <p>Same currents result in the same potential drops</p> Signup and view all the answers

    What is the effect of connecting resistors in parallel on the total resistance compared to the individual resistances?

    <p>The total resistance is less than the smallest individual resistance</p> Signup and view all the answers

    What represents the total energy supplied by a battery per coulomb of charge, even when there is no current flowing through it?

    <p>Electromotive Force (emf)</p> Signup and view all the answers

    In a practical circuit, which factor causes the actual voltage provided by a battery to be less than its emf?

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

    What happens to the current distribution in parallel circuits?

    <p>Different currents flow through each component</p> Signup and view all the answers

    What is characteristic of resistors connected end-to-end in series?

    <p>Different currents flow through each resistor</p> Signup and view all the answers

    Which factor determines the maximum power a battery can deliver to an external load?

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

    What factor leads to different potential differences across each resistor in a parallel circuit?

    <p>Different currents flowing through each component</p> Signup and view all the answers

    What does the total resistance represent in a series circuit compared to parallel circuits?

    <p>Total resistance in series is more than total resistance in parallel</p> Signup and view all the answers

    In a complex circuit with both series and parallel connections, which approach should be taken to analyze the circuit?

    <p>Break the circuit into simpler sections, calculate equivalent resistances, and apply Ohm's law and power formulas accordingly.</p> Signup and view all the answers

    If a battery has an emf of 12V and an internal resistance of 0.8, what is the terminal voltage when delivering a current of 3A to an external load?

    <p>9.6V</p> Signup and view all the answers

    In a series circuit with resistors of 2, 4, and 6, and a total voltage of 24V, what is the power dissipated in the 4 resistor?

    <p>32W</p> Signup and view all the answers

    If a battery has an emf of 9V and an internal resistance of 0.5, what is the maximum power it can deliver to an external load?

    <p>40.5W</p> Signup and view all the answers

    In a parallel circuit with three resistors of 3, 6, and 9, what is the current through the 6 resistor if the total current is 6A and the voltage source is 12V?

    <p>2A</p> Signup and view all the answers

    In a series circuit with three resistors of 2, 4, and 6, and a total voltage of 24V, what is the potential difference across the 6 resistor?

    <p>10V</p> Signup and view all the answers

    If a battery has an emf of 12V and an internal resistance of 0.6, and it is connected to a load with a resistance of 3, what is the power dissipated in the internal resistance?

    <p>3.6W</p> Signup and view all the answers

    In a parallel circuit with two resistors of 4 and 8, if the total current is 6A and the voltage source is 24V, what is the power dissipated in the 8 resistor?

    <p>48W</p> Signup and view all the answers

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