Podcast
Questions and Answers
In the context of electrical conductivity, what does the symbol σ represent?
In the context of electrical conductivity, what does the symbol σ represent?
- Electrical conductivity (correct)
- Electric field
- Cross-sectional area
- Resistance
What is the mathematical expression for current density J in terms of the applied electric field E?
What is the mathematical expression for current density J in terms of the applied electric field E?
- J = E/σ
- J = Eσ
- J = σ/E
- J = σE (correct)
How can Ohm's law be expressed using the resistance R, current I, and potential difference V?
How can Ohm's law be expressed using the resistance R, current I, and potential difference V?
- V = I/R
- I = RV
- I = V/R
- V = IR (correct)
What is the unit of resistance R when measured in ohms?
What is the unit of resistance R when measured in ohms?
In the context of Emf (Electromotive force), what is typically responsible for providing the non-electrostatic agency?
In the context of Emf (Electromotive force), what is typically responsible for providing the non-electrostatic agency?
What is the formula for calculating the potential difference V across a material with resistance R and current I passing through it?
What is the formula for calculating the potential difference V across a material with resistance R and current I passing through it?
When measuring resistance, what does 1 ohm represent in terms of potential difference and current?
When measuring resistance, what does 1 ohm represent in terms of potential difference and current?
What does Kirchhoff's voltage law state about the sum of voltage drops in a closed loop in an electrical circuit?
What does Kirchhoff's voltage law state about the sum of voltage drops in a closed loop in an electrical circuit?
$ ext{If } V = 5V ext{ and } R = 2 ext{ ohms, what is the current flowing through the material?}$
$ ext{If } V = 5V ext{ and } R = 2 ext{ ohms, what is the current flowing through the material?}$
