This comparison covers Summary Comparison Table within I-V Characteristics for GCSE Physics. Revise I-V Characteristics in Extra Topics for GCSE Physics with 13 exam-style questions and 11 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 5 of 12 in this topic. Use this comparison to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 12
Practice
13 questions
Recall
11 flashcards
⚡ Summary Comparison Table
| Component | I-V Graph Shape | Resistance Behaviour | Ohmic? |
|---|---|---|---|
| Ohmic resistor (at constant temp) | Straight line through origin | Constant | Yes |
| Filament lamp | Curve through origin, flattening at high V | Increases with temperature | No |
| Diode (forward) | Near-zero then sharp upward curve from ~0.6 V | Very high below threshold, then very low | No |
| Diode (reverse) | Flat (virtually no current) | Extremely high (blocks current) | No |