Resistance and Ohm's Law in Electrical Circuits

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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?

Resistance Signup and view all the answers

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

Electronic tubes Signup and view all the answers

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

Resistance Signup and view all the answers

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

R is directly proportional to l when temperature and cross-sectional area are constant Signup and view all the answers

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

R is inversely proportional to A when temperature and length are constant Signup and view all the answers

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

Resistivity or specific resistance of the conductor 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?

R = ρ (ohm) Signup and view all the answers

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

ohm-meter (ohm-m) Signup and view all the answers

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

Nature of the material and temperature Signup and view all the answers

What is the definition of 1 ohm?

The resistance of a conductor is one ohm if one-ampere current flows through it under a potential difference of one volt. Signup and view all the answers

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

$1 \ohm = 1 \volt / 1 \ampere$ Signup and view all the answers

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

Kiloohm and megaohm Signup and view all the answers

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

The resistance decreases by about 50%. Signup and view all the answers

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

The resistance decreases. Signup and view all the answers

Resistance and Ohm's Law in Electrical Circuits

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