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Questions and Answers
What is the SI unit of current?
Which type of quantity is electric current?
What is the cause of conductance in good conductors like metals?
In which direction does electric current flow with respect to the flow of positive charge?
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What is the relationship between current density and area of cross-section in a conductor?
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What is the relationship between drift velocity and mobility in a conductor?
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What does the temperature coefficient of resistance determine?
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In what situation would the resistance of a conductor double?
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What happens to the resistivity of a material when it shows superconductivity?
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How is conductivity related to resistivity in a conductor?
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Study Notes
Electric Current
- The SI unit of current is the ampere (A).
- Electric current is a scalar quantity.
Conductance and Flow of Current
- Good conductors like metals have high conductance due to the presence of free electrons.
- Electric current flows in the direction of the flow of positive charge.
Current Density and Area of Cross-section
- Current density is inversely proportional to the area of cross-section in a conductor.
Drift Velocity and Mobility
- Drift velocity is directly proportional to mobility in a conductor.
Resistance and Temperature Coefficient
- The temperature coefficient of resistance determines the change in resistance of a conductor with a change in temperature.
- If the temperature coefficient of resistance is positive, the resistance of a conductor will double when the temperature is doubled.
Superconductivity
- When a material shows superconductivity, its resistivity becomes zero.
Conductivity and Resistivity
- Conductivity is the reciprocal of resistivity in a conductor.
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Description
Test your knowledge on Current Electricity with CBSE Class 12 Notes from Chapter 3. Explore concepts like electric charge flow and scalar quantities. Get ready for your exams with this helpful quiz!
