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Questions and Answers
What happens to the resistance of the lamp according to the content?
What happens to the resistance of the lamp according to the content?
- The resistance increases. (correct)
- The resistance remains constant.
- The resistance fluctuates unpredictably.
- The resistance decreases.
Why does the resistance change in such a way?
Why does the resistance change in such a way?
- The increase in current heats the filament, increasing atomic vibrations which increases resistance. (correct)
- The material of the lamp changes its properties at higher currents; reducing resistance.
- The increase in current causes a reduction in atomic collisions and decreases resistance.
- The increase in current has no impact on the filament temperature or resistance.
What is the immediate effect of increasing the potential difference across the lamp?
What is the immediate effect of increasing the potential difference across the lamp?
- A decrease in the lamp's current.
- An increase in the lamp's current. (correct)
- Unpredictable changes in the lamp's current.
- No change in the lamp's current.
If the potential difference across a lamp is increased, what happens to the lamp’s temperature and resistance?
If the potential difference across a lamp is increased, what happens to the lamp’s temperature and resistance?
Which statement best describes the relationship between current and resistance in the given context?
Which statement best describes the relationship between current and resistance in the given context?
Flashcards
What happens to the resistance of a lamp when the current increases?
What happens to the resistance of a lamp when the current increases?
The resistance of the lamp filament increases as the temperature rises. This is because the atoms in the filament vibrate more vigorously, making it harder for electrons to flow through.
How does temperature affect the resistance of a conductor?
How does temperature affect the resistance of a conductor?
The resistance of a conductor increases as its temperature increases. This is because the atoms in the conductor vibrate more vigorously, making it harder for electrons to flow through. This effect is particularly pronounced in materials like tungsten, which is used in lamp filaments.
What is the relationship between current, potential difference, and resistance in a lamp?
What is the relationship between current, potential difference, and resistance in a lamp?
While the current increases as the potential difference increases, the resistance of the lamp filament also increases. This is because the filament gets hotter as more current flows through it, and the resistance of a material generally increases with temperature.
Why does the resistance of a lamp filament increase with current?
Why does the resistance of a lamp filament increase with current?
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Explain the relationship between current, temperature, and resistance in a lamp.
Explain the relationship between current, temperature, and resistance in a lamp.
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Study Notes
Resistance Change in Lamp
- Increasing the potential difference (p.d.) of the supply leads to a higher current in the lamp.
Statement
- The resistance of the lamp increases.
Explanation
- The increase in current causes the temperature of the filament in the lamp to rise.
- As the filament's temperature rises, its resistance also increases.
- This is due to the increased vibrations of the atoms within the filament. These vibrations make it harder for the electrons to flow through the filament.
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Description
Explore the relationship between potential difference, current, and resistance in a lamp. This quiz explains how an increase in current raises the temperature of the filament, subsequently increasing its resistance. Test your understanding of these concepts in the context of electrical circuits.
