Imagine trying to push water through different pipes. A wide, smooth pipe offers little resistance — water flows easily. A narrow, rough pipe resists the flow — you need more pressure to push the same amount through. Electrical resistance works the same way. A thick copper wire has low resistance; a thin nichrome wire has high resistance. The equation V = IR tells you that for a given voltage, higher resistance means less current can flow.
This introduction covers The Narrow Pipe Problem within Resistance & Ohm's Law for GCSE Physics. Revise Resistance & Ohm's Law in Electricity for GCSE Physics with 16 exam-style questions and 30 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 1 of 16 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Resistance & Ohm's Law
Which of the following best describes electrical resistance?
Explain what is meant by an ohmic conductor.
Quick recall flashcards
Ohm's Law equation?
V = IR where V = voltage (V), I = current (A), R = resistance (Ω)
Unit of resistance?
Ohm (Ω)