Podcast
Questions and Answers
What happens to the resistance of a conductor if its length is doubled, keeping the area of cross-section constant?
What happens to the resistance of a conductor if its length is doubled, keeping the area of cross-section constant?
- Remains the same
- Cannot be determined
- It halves
- It doubles (correct)
Which material property determines how well a material resists the flow of electric current?
Which material property determines how well a material resists the flow of electric current?
- Drift velocity
- Conductivity
- Resistivity (correct)
- Electric potential
In which scenario would the resistance of a conductor increase?
In which scenario would the resistance of a conductor increase?
- Increasing its cross-sectional area
- Decreasing its length (correct)
- Using a material with high conductivity
- Decreasing the temperature
What effect does increasing the temperature have on the resistivity of most materials?
What effect does increasing the temperature have on the resistivity of most materials?
What happens to the total resistance when resistors are connected in parallel?
What happens to the total resistance when resistors are connected in parallel?
What is the relationship between voltage, current, and resistance in an electrical circuit?
What is the relationship between voltage, current, and resistance in an electrical circuit?
What impurity atom can be doped into pure silicon to make it a p-type semiconductor?
What impurity atom can be doped into pure silicon to make it a p-type semiconductor?
How can the electrical conductivity of pure germanium be increased?
How can the electrical conductivity of pure germanium be increased?
What is the resistivity range of a semiconductor at room temperature?
What is the resistivity range of a semiconductor at room temperature?
What is the forbidden energy gap between the valence band and the conduction band in a semiconductor?
What is the forbidden energy gap between the valence band and the conduction band in a semiconductor?
What is the forbidden energy gap for germanium crystal at 0 K?
What is the forbidden energy gap for germanium crystal at 0 K?
What is the temperature coefficient of resistance of a semiconductor?
What is the temperature coefficient of resistance of a semiconductor?
What is the resistance of a wire if the slope of its 𝐼 − 𝑉 characteristic is 2 mA/volt?
What is the resistance of a wire if the slope of its 𝐼 − 𝑉 characteristic is 2 mA/volt?
Which of the following is NOT a limitation of Ohm's law?
Which of the following is NOT a limitation of Ohm's law?
What is the resistivity of a material if its resistance is 50 Ω and length is 10 m?
What is the resistivity of a material if its resistance is 50 Ω and length is 10 m?
In an electric circuit, five cells with emf 4V and internal resistance 0.5 Ω are connected in series. What is the total emf of this combination?
In an electric circuit, five cells with emf 4V and internal resistance 0.5 Ω are connected in series. What is the total emf of this combination?
When a wire's length increases by 20%, how does its resistance change?
When a wire's length increases by 20%, how does its resistance change?
What are the characteristic features of a material suitable for fuse wires?
What are the characteristic features of a material suitable for fuse wires?
