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Questions and Answers
What determines the resistance of a conductor?
What determines the resistance of a conductor?
- The material of the conductor (correct)
- The shape of the conductor
- The potential difference across its ends
- The length of the conductor only
According to Ohm's law, what is directly proportional to the current through a resistor?
According to Ohm's law, what is directly proportional to the current through a resistor?
- The cross-sectional area of the resistor
- The resistance of the resistor
- The length of the resistor
- The voltage across the resistor (correct)
Which characteristic is typically seen in the I-V graph of ohmic conductors?
Which characteristic is typically seen in the I-V graph of ohmic conductors?
- Parabolic curve
- Exponential growth
- Linear relation (correct)
- Nonlinear relation
Which statement about resistance and ohmic conductors is true?
Which statement about resistance and ohmic conductors is true?
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What differentiates non-ohmic materials from ohmic materials?
What differentiates non-ohmic materials from ohmic materials?
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Study Notes
Resistance
- A battery can establish a potential difference across a conductor.
- The resistance of a conductor depends on the material it is made of.
- Two identical rods made of different materials will have different potential differences across their ends.
Ohm's Law
- Ohm's law describes the relationship between electromotive force (EMF), current, and other physical quantities.
- The current (I) is proportional to the voltage (V) in a conductor.
- This proportionality is a characteristic of a particular conductor.
- The I-V characteristics of most conductors are linear.
- Non-ohmic materials have a nonlinear I-V relationship.
- The resistance of a conductor is not a fixed value, but rather a specific value for a particular conductor.
- Ohm's law implies that the current through a resistor is proportional to the voltage across it.
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Description
Understand the concept of resistance in conductors and Ohm's Law, which relates electromotive force, current, and physical quantities.
