CH 7: Ohm's law
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Questions and Answers

According to Ohm's Law, what is the relationship between potential difference (V), current (I), and resistance (R)?

  • V = I * R
  • V = I + R
  • V = IR (correct)
  • V = I / R

    • Which factor does NOT influence the resistance of a conductor?

  • Material of the conductor
  • Frequency of the current (correct)
  • Length of the conductor
  • Diameter of the conductor

    • In a series circuit, how is the total resistance calculated?

  • R_total = (R₁ + R₂ + ...) / (R₁ * R₂ * ...)
  • R_total = 1 / (1/R₁ + 1/R₂ + ...)
  • R_total = R₁ + R₂ + ... (correct)
  • R_total = R₁ * R₂ * ...

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

    <p>R_total = 1 / (1/R₁ + 1/R₂ + ...)</p> Signup and view all the answers

    What is the defining characteristic of an Ohmic conductor?

    <p>The resistance remains constant as the voltage changes</p> Signup and view all the answers

    In a series circuit, how is the potential difference (voltage) distributed among the components?

    <p>The potential difference is divided among the components</p> Signup and view all the answers

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

    <p>The current is divided among the branches</p> Signup and view all the answers

    Which of the following materials is typically considered an Ohmic conductor?

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

    How does the resistance of a conductor change with an increase in temperature?

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

    What is the relationship between the diameter of a conductor and its resistance?

    <p>Resistance is inversely proportional to the diameter</p> Signup and view all the answers

    What happens to the total resistance in a series circuit when more resistors are added?

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

    In a parallel circuit, what is the effect of adding more resistors?

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

    What is the characteristic of Non-Ohmic Conductors regarding resistance?

    <p>Resistance varies with voltage or current</p> Signup and view all the answers

    How do real-world applications benefit from understanding series and parallel circuits?

    <p>By designing and troubleshooting electrical systems</p> Signup and view all the answers

    What does Ohm's Law relate to in electrical circuits?

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

    Why is it important to verify Ohm's Law experimentally?

    <p>To observe the linear relationship between voltage and current</p> Signup and view all the answers

    How can one apply the principles of series and parallel circuits in real-world problems?

    <p>By calculating wiring requirements for lighting at home</p> Signup and view all the answers

    What can one determine using Ohm's Law and rules for series and parallel circuits in a given problem?

    <p>Individual voltages, currents, or resistances in a circuit.</p> Signup and view all the answers

    What is the purpose of constructing series and parallel circuits using identical resistors?

    <p>To measure total and individual currents and voltages.</p> Signup and view all the answers

    What is the effect of adding more resistors in a series circuit?

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

    What is the relationship between the total resistance and the total current in a parallel circuit?

    <p>As more resistors are added, the total resistance decreases and the total current increases.</p> Signup and view all the answers

    What is the purpose of verifying Ohm's Law experimentally?

    <p>To observe the linear relationship between voltage, current, and resistance.</p> Signup and view all the answers

    What is a crucial benefit of understanding the principles of series and parallel circuits?

    <p>It enables the design and troubleshooting of electrical systems.</p> Signup and view all the answers

    What is the characteristic of non-Ohmic conductors regarding their resistance?

    <p>Their resistance varies with voltage or current.</p> Signup and view all the answers

    What is the relationship between the total resistance and the total current in a series circuit?

    <p>As the total resistance decreases, the total current decreases.</p> Signup and view all the answers

    How can the principles of series and parallel circuits be applied in real-world problems?

    <p>To determine the wiring requirements for home lighting or the specifications for electronic components.</p> Signup and view all the answers

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

    <p>The individual branch currents are directly proportional to the total current.</p> Signup and view all the answers

    What is the effect of adding more resistors in a parallel circuit?

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

    What can be determined using Ohm's Law and the rules for series and parallel circuits?

    <p>The individual voltages, currents, or resistances in a circuit.</p> Signup and view all the answers

    If a resistor in a series circuit is removed, what will happen to the total resistance?

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

    Which statement is true about the potential difference (voltage) in a parallel circuit?

    <p>The potential difference is the same across all components</p> Signup and view all the answers

    If the diameter of a conductor is doubled, how does its resistance change?

    <p>The resistance is halved</p> Signup and view all the answers

    Which of the following is an example of a non-Ohmic conductor?

    <p>A semiconductor diode</p> Signup and view all the answers

    In a series circuit with three resistors, if two resistors have values of 10Ω and 20Ω, what is the minimum possible value of the third resistor?

    <p>0Ω</p> Signup and view all the answers

    What happens to the current in a parallel circuit if one branch is removed?

    <p>The current in the remaining branches decreases</p> Signup and view all the answers

    According to Ohm's Law, if the potential difference (V) across a conductor is doubled and the resistance (R) remains constant, what happens to the current (I)?

    <p>The current (I) doubles</p> Signup and view all the answers

    If the length of a conductor is tripled, how does its resistance change?

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

    In a parallel circuit with three identical resistors, if one resistor is short-circuited (resistance becomes zero), what happens to the total resistance?

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

    Which of the following statements is true about the current in a series circuit?

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

    What happens to the total current in a series circuit as more resistors are added?

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

    Which statement best describes the behavior of non-Ohmic conductors with respect to resistance?

    <p>Resistance varies with voltage or current</p> Signup and view all the answers

    If more resistors are added in parallel, what happens to the total resistance of the circuit?

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

    In a circuit with resistors in parallel, what effect does adding more resistors have on the total current?

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

    What is the primary purpose of constructing series and parallel circuits using identical resistors?

    <p>To simplify circuit calculations</p> Signup and view all the answers

    In a mixed series-parallel circuit, what can be determined by analysis?

    <p>Total resistance, total current, and individual branch currents and voltages</p> Signup and view all the answers

    When verifying Ohm's Law experimentally, what is plotted to observe the relationship?

    <p>Voltage-Current (V-I) graph</p> Signup and view all the answers

    What can practical applications and problem-solving exercises help determine in electrical circuits?

    <p>Unknown quantities such as individual voltages, currents, or resistances</p> Signup and view all the answers

    How does the total resistance behave in a parallel circuit when more resistors are added?

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

    In what way do series connections affect total resistance compared to parallel connections?

    <p>Series connections increase total resistance while parallel connections reduce it.</p> Signup and view all the answers

    According to Ohm's Law, if the resistance (R) of a conductor remains constant, and the potential difference (V) is doubled, what happens to the current (I)?

    <p>The current (I) is doubled</p> Signup and view all the answers

    In a parallel circuit, if one of the resistors is short-circuited (resistance becomes zero), what happens to the total resistance of the circuit?

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

    What is the relationship between the potential difference (voltage) across components in a series circuit?

    <p>The potential difference is divided among the components</p> Signup and view all the answers

    Which of the following materials is typically considered a non-Ohmic conductor?

    <p>Semiconductor diodes</p> Signup and view all the answers

    If the length of a conductor is tripled, and all other factors remain constant, how does its resistance change?

    <p>The resistance is tripled</p> Signup and view all the answers

    In a series circuit with three identical resistors, if one of the resistors is removed, how does the total resistance of the circuit change?

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

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

    <p>The total current is the sum of the individual branch currents</p> Signup and view all the answers

    How does the resistance of a conductor change with an increase in temperature?

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

    What is the relationship between the total resistance and the total current in a series circuit?

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

    What is the effect of adding more resistors in a parallel circuit?

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

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