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Questions and Answers
Which of the following materials has the highest electrical conductivity?
Which of the following materials has the highest electrical conductivity?
- Wood
- Glass
- Copper (correct)
- Rubber
In which direction does conventional current flow?
In which direction does conventional current flow?
- It depends on the type of material
- It flows randomly in all directions
- From positive to negative (correct)
- From negative to positive
What is the SI unit of electric current?
What is the SI unit of electric current?
- Ampere (correct)
- Volt
- Joule
- Ohm
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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