MYP Physics · 13 · data analysis
Compare a resistor and a filament lamp
Electricity · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- routine
- Marks
- 7
- Topics
- 2
- Answer
- Complete
A class records current at different potential differences for a fixed resistor and a filament lamp.
| Potential difference / V | Resistor current / A | Lamp current / A |
|---|---|---|
| 1.0 | 0.10 | 0.08 |
| 2.0 | 0.20 | 0.14 |
| 3.0 | 0.30 | 0.18 |
| 4.0 | 0.40 | 0.21 |
| 5.0 | 0.50 | 0.23 |
- a
Calculate Calculate the resistance of the fixed resistor at 4.0 V.
2 marks - b
Analyse Use the data to decide which component is ohmic over this range.
3 marks - c
Explain Explain the physical reason for the changing resistance of the filament lamp.
2 marks
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a
Calculate Calculate the resistance of the fixed resistor at 4.0 V.
Read the data before explaining it. Quote the relevant values or trend, show the comparison or calculation, and then connect that numerical evidence to the physical conclusion—including uncertainty or anomalies when they matter.
- 1
Uses R = V ÷ I with V = 4.0 V and I = 0.40 A.
- 2
Obtains R = 10 Ω.
b
Analyse Use the data to decide which component is ohmic over this range.
Read the data before explaining it. Quote the relevant values or trend, show the comparison or calculation, and then connect that numerical evidence to the physical conclusion—including uncertainty or anomalies when they matter.
- 1
Identifies the fixed resistor as ohmic.
- 2
Uses evidence that current is directly proportional to potential difference, with V ÷ I constant at 10 Ω.
- 3
Explains that the lamp is non-ohmic because its current does not rise in direct proportion to voltage, so its resistance changes.
c
Explain Explain the physical reason for the changing resistance of the filament lamp.
Read the data before explaining it. Quote the relevant values or trend, show the comparison or calculation, and then connect that numerical evidence to the physical conclusion—including uncertainty or anomalies when they matter.
- 1
States that the filament becomes hotter as current or power increases.
- 2
Explains that increased lattice vibration makes electron motion more difficult, increasing resistance.
Private on this device