This key facts covers Key Facts Summary within Resistance & Ohm's Law for GCSE Physics. Revise Resistance & Ohm's Law in Electricity for GCSE Physics with 14 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 9 of 16 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 9 of 16
Practice
14 questions
Recall
30 flashcards
📋 Key Facts Summary
- Ohm's Law: V = IR
- Resistance unit: ohms (Ω)
- Longer wire → more resistance
- Thicker wire → less resistance
- Hotter metal → more resistance (more ionic vibration)
- Hotter thermistor → less resistance
- Brighter LDR → less resistance
- Filament lamp: resistance increases as it heats up → curved V-I graph
- Diode: allows current in ONE direction only