Resistance and Ohm's Law in Electrical Circuits
17 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which element cannot be analyzed using Ohm’s law?

  • Transistors
  • Electronic tubes
  • Capacitors
  • Resistors (correct)

What property of a substance opposes the flow of electric current?

  • Voltage
  • Current
  • Resistance (correct)
  • Power

What is the unit of resistance?

  • Watt
  • Ampere
  • Ohm (correct)
  • Volt

In Ohm's law, what does 'R' stand for?

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

Which components are not bilateral and hence not suitable for Ohm's law analysis?

<p>Electronic tubes (B)</p> Signup and view all the answers

What causes the opposition to the flow of charges in electrical conductors?

<p>Resistance (A)</p> Signup and view all the answers

What is the relationship between the resistance (R) of a conductor and its length (l)?

<p>R is directly proportional to l when temperature and cross-sectional area are constant (D)</p> Signup and view all the answers

What is the relationship between the resistance (R) of a conductor and its cross-sectional area (A)?

<p>R is inversely proportional to A when temperature and length are constant (C)</p> Signup and view all the answers

What is the constant of proportionality ρ (rho) in the equation R = ρ(l/A)?

<p>Resistivity or specific resistance of the conductor (A)</p> Signup and view all the answers

If the length of a conductor is 1 m and its cross-sectional area is 1 m^2, what is the resistance of the conductor?

<p>R = ρ (ohm) (B)</p> Signup and view all the answers

What is the unit of resistivity (ρ) in the SI system?

<p>ohm-meter (ohm-m) (A)</p> Signup and view all the answers

What does the resistivity (ρ) of a material depend on?

<p>Nature of the material and temperature (C)</p> Signup and view all the answers

What is the definition of 1 ohm?

<p>The resistance of a conductor is one ohm if one-ampere current flows through it under a potential difference of one volt. (C)</p> Signup and view all the answers

What is the relationship between 1 ohm, 1 volt, and 1 ampere?

<p>$1 \ohm = 1 \volt / 1 \ampere$ (B)</p> Signup and view all the answers

What is the resistance of a conductor measured in when it is high?

<p>Kiloohm and megaohm (D)</p> Signup and view all the answers

What happens to the resistance of a bismuth wire when it is placed in a magnetic field?

<p>The resistance decreases by about 50%. (D)</p> Signup and view all the answers

What happens to the resistance of selenium when it is exposed to light?

<p>The resistance decreases. (D)</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser