This memory aid covers Memory Aid 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 12 of 16 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Topic position
Section 12 of 16
Practice
14 questions
Recall
30 flashcards
🧠 Memory Aid
VIR Triangle — "Very Important Relationship":
Write V at the top, I and R at the bottom. Cover the letter you want to find: V on top alone = I × R; I on bottom-left = V ÷ R; R on bottom-right = V ÷ I.
Non-ohmic components — "FDT Changes":
Filament lamp, Diode, Thermistor — these three all have changing resistance. Everything else (fixed resistors) is ohmic.
Thermistor vs LDR — "Hot is Less, Bright is Less":
Hotter thermistor = less resistance. Brighter LDR = less resistance. Both sensors work the same way — the thing they detect reduces their resistance.
Wire resistance factors — "LAMT":
Length (more = more R), Area (more = less R), Material, Temperature.