Podcast
Questions and Answers
Which of the following materials has the highest electrical conductivity?
Which of the following materials has the highest electrical conductivity?
In which direction does conventional current flow?
In which direction does conventional current flow?
What is the SI unit of electric current?
What is the SI unit of electric current?
What is the relationship between current and resistance in a circuit?
What is the relationship between current and resistance in a circuit?
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What effect does doubling the voltage have on the current in a circuit with constant resistance?
What effect does doubling the voltage have on the current in a circuit with constant resistance?
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How does the thickness of a wire affect its electrical resistance?
How does the thickness of a wire affect its electrical resistance?
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Study Notes
Electrical Conductivity
- Silver is the material with the highest electrical conductivity, followed by copper and gold.
Direction of Conventional Current
- Conventional current flows from the positive terminal to the negative terminal of a power source.
SI Unit of Electric Current
- The SI unit of electric current is the ampere (A).
Current and Resistance Relationship
- According to Ohm's Law, the relationship between current (I) and resistance (R) in a circuit is given by the formula I = V/R, where V is voltage.
Effect of Doubling Voltage
- Doubling the voltage in a circuit with constant resistance results in doubling the current, as per Ohm's Law.
Thickness of a Wire and Electrical Resistance
- Increasing the thickness (or cross-sectional area) of a wire decreases its electrical resistance, allowing more current to flow through the wire.
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Description
Test your knowledge of electric current in Physics Class 9 with questions about SI unit of electric current, electrical conductivity, and conventional current direction.
