Podcast
Questions and Answers
What is the unit of resistivity for a material?
What is the unit of resistivity for a material?
- Ohm
- Ohm metre (correct)
- Metre
- Volt
How is a rheostat used to regulate current in a circuit?
How is a rheostat used to regulate current in a circuit?
- By changing the capacitance gradually
- By changing the voltage gradually
- By changing the current gradually
- By changing the resistance gradually (correct)
In conductors, what is responsible for the flow of current?
In conductors, what is responsible for the flow of current?
- Electrons (correct)
- Protons
- Neutrons
- Ions
What is the role of emf in enabling current flow in a circuit?
What is the role of emf in enabling current flow in a circuit?
What is resistivity?
What is resistivity?
If the length of a uniform wire is doubled, what happens to its resistivity?
If the length of a uniform wire is doubled, what happens to its resistivity?
What happens to the resistance of a conductor when its temperature increases?
What happens to the resistance of a conductor when its temperature increases?
In the parallel connection of cells, what happens to the current if the number of cells is increased?
In the parallel connection of cells, what happens to the current if the number of cells is increased?
What is the resistance of the conductor in the given table?
What is the resistance of the conductor in the given table?
From the first two circuits, which lamp is likely to glow with more brightness and why?
From the first two circuits, which lamp is likely to glow with more brightness and why?
What are two more factors that influence the resistance of a conductor, in addition to length and thickness?
What are two more factors that influence the resistance of a conductor, in addition to length and thickness?
How does the resistance of a conductor change with temperature?
How does the resistance of a conductor change with temperature?
