Voltage Drops and Phase Relationships in Circuits
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Questions and Answers

What effect does an increase in current have on the magnetic field in a coil?

  • The magnetic field contracts and only affects the loop where the current is increasing.
  • The magnetic field expands and cuts across all the loops in the coil. (correct)
  • The magnetic field reverses direction and opposes the increase in current.
  • The magnetic field remains constant and does not affect the other loops in the coil.

What is the purpose of the core material in an inductor?

  • To increase the inductance of the coil. (correct)
  • To insulate the coil from external magnetic fields.
  • To provide structural support for the coil.
  • To decrease the inductance of the coil.

What is the effect of an induced current on the change in the original current?

  • The induced current opposes the change in the original current. (correct)
  • The induced current has no effect on the change in the original current.
  • The induced current reverses the direction of the original current.
  • The induced current amplifies the change in the original current.

What is the schematic symbol for an air-core inductor?

<p>A coil with no lines across the top. (D)</p> Signup and view all the answers

What is the effect of forming a conductor into a loop or coil?

<p>It increases the property of inductance. (A)</p> Signup and view all the answers

How do the loops in a coil affect each other?

<p>The current in each loop affects all the other loops in the coil. (A)</p> Signup and view all the answers

What is the formula used to calculate the inductive reactance (XL) of a component in the circuit?

<p>$XL = 2\pi fL$ (D)</p> Signup and view all the answers

What is the formula used to calculate the capacitive reactance (XC) of a component in the circuit?

<p>$XC = \frac{1}{2\pi fC}$ (A)</p> Signup and view all the answers

What is the formula used to calculate the resistive current (IR) in the circuit?

<p>$IR = \frac{V_{GEN}}{R}$ (A)</p> Signup and view all the answers

What is the formula used to calculate the capacitive current (IC) in the circuit?

<p>$IC = \frac{V_{GEN}}{XC}$ (B)</p> Signup and view all the answers

What is the formula used to calculate the inductive current (IL) in the circuit?

<p>$IL = \frac{V_{GEN}}{XL}$ (A)</p> Signup and view all the answers

What is the relationship between the individual branch currents and the total current drawn from the source (IT) in a parallel LCR circuit?

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

What is the relationship between the voltage drops across the components in a series LCR circuit?

<p>The voltage drops are out of phase with the circuit current. (A)</p> Signup and view all the answers

How can we determine the voltage drops across the individual components in a series LCR circuit?

<p>By measuring the current and impedance of each component using Ohm's law. (A)</p> Signup and view all the answers

What is the purpose of constructing a phasor diagram for a series LCR circuit?

<p>To visualize the phase relationships among the components. (C)</p> Signup and view all the answers

What is the overall effect of reactance on the series LCR circuit described?

<p>The overall effect is capacitive. (C)</p> Signup and view all the answers

How is the total equivalent reactance (Xeq) calculated in a series LCR circuit?

<p>Xeq = XL - XC (C)</p> Signup and view all the answers

What is the value of the total equivalent reactance (Xeq) in the example series LCR circuit?

<p>750 Ω (C)</p> Signup and view all the answers

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