Current Electricity — A-Level Physics Revision
Revise Current Electricity for A-Level Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
At a glance
- What StudyVector is
- An exam-practice platform with board-aligned questions, explanations, and adaptive next steps.
- This topic
- Current Electricity in A-Level Physics: explanation, examples, and practice links on this page.
- Who it’s for
- Students revising A-Level Physics for UK exams.
- Exam boards
- Practice is aligned to major specifications (AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP).
- Free plan
- Sign up free to use tutor paths and feedback on your answers. Free access is Free while we build toward our first production release. Pricing
- What makes it different
- Syllabus-shaped practice and progress tracking—not generic AI answers.
Topic has curated content entry with explanation, mistakes, and worked example. [auto-gate:promote; score=70.6]
Next in this topic area
Next step: Electrical Circuits
Continue in the same course — structured practice and explanations on StudyVector.
Go to Electrical CircuitsWhat is Current Electricity?
This topic introduces the fundamental concepts of electric current, potential difference, and resistance. It covers Ohm's law as a special case for ohmic conductors and introduces the concept of resistivity, an intrinsic property of a material that determines its resistance. You will learn how factors like length, cross-sectional area, and material type affect the resistance of a conductor.
Board notes: Current, potential difference, resistance, and resistivity are fundamental concepts covered by all A-Level Physics boards (AQA, Edexcel, OCR). The experimental determination of resistivity is a common practical assessment. All boards expect an understanding of I-V characteristics for ohmic and non-ohmic components.
Step-by-step explanationWorked example
Calculate the resistance of a 2.0 m long copper wire with a cross-sectional area of 0.5 mm². The resistivity of copper is 1.7 x 10^-8 Ωm. First, convert the area to m²: 0.5 mm² = 0.5 x (10^-3 m)² = 0.5 x 10^-6 m². Now use the formula R = ρL/A: R = (1.7 x 10^-8 Ωm * 2.0 m) / (0.5 x 10^-6 m²) = 0.068 Ω. The resistance of the wire is 0.068 Ω.
Mini lesson for Current Electricity
1. Understand the core idea
This topic introduces the fundamental concepts of electric current, potential difference, and resistance. It covers Ohm's law as a special case for ohmic conductors and introduces the concept of resistivity, an intrinsic property of a material that determines its resistance.
Can you explain Current Electricity without copying the notes?
2. Turn it into marks
Calculate the resistance of a 2.
Underline the method, evidence, or command-word move that would earn credit in A-Level Paper 1 — Particles, Waves & Electricity.
3. Fix the likely mark leak
Watch for this mistake: Confusing resistance and resistivity. Resistance is a property of a specific component (R = V/I), while resistivity (ρ) is a property of the material itself. Resistance depends on the material's resistivity and its dimensions (R = ρL/A).
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for Current Electricity. Free to start; sign in to save progress.
Current Electricity practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one A-Level sentence, explain what Current Electricity is testing.
Answer: This topic introduces the fundamental concepts of electric current, potential difference, and resistance. It covers Ohm's law as a special case for ohmic conductors and introduces the concept of resistivity, an intrinsic property of a material that determines its resistance.
Mark focus: Precise definition and topic focus.
Question 2
A Current Electricity question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing resistance and resistivity. Resistance is a property of a specific component (R = V/I), while resistivity (ρ) is a property of the material itself. Resistance depends on the material's resistivity and its dimensions (R = ρL/A)." What should their next repair task be?
Answer: Do one Current Electricity question and review the mistake type.
Mark focus: Error correction and next-step practice.
Current Electricity flashcards
Core idea
What is the main idea in Current Electricity?
This topic introduces the fundamental concepts of electric current, potential difference, and resistance. It covers Ohm's law as a special case for ohmic conductors and introduces the concept of resistivity, an intrin...
Common mistake
What mistake should you avoid in Current Electricity?
Confusing resistance and resistivity. Resistance is a property of a specific component (R = V/I), while resistivity (ρ) is a property of the material itself.
Practice
What is one useful practice task for Current Electricity?
Answer one Current Electricity question and review the mistake type.
Exam board
How should you use board notes for Current Electricity?
Current, potential difference, resistance, and resistivity are fundamental concepts covered by all A-Level Physics boards (AQA, Edexcel, OCR). The experimental determination of resistivity is a common practical assess...
Common mistakes
- 1Confusing resistance and resistivity. Resistance is a property of a specific component (R = V/I), while resistivity (ρ) is a property of the material itself. Resistance depends on the material's resistivity and its dimensions (R = ρL/A).
- 2Assuming all components obey Ohm's Law. Ohm's law (V ∝ I) only applies to ohmic conductors (like a metal wire at constant temperature). Components like semiconductor diodes and filament lamps are non-ohmic.
- 3Using incorrect units in the resistivity equation. A common mistake is forgetting to convert length to metres (m) and cross-sectional area to square metres (m²) when calculating resistivity.
Current Electricity exam questions
Exam-style questions for Current Electricity with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
Current Electricity exam questionsGet help with Current Electricity
Get a personalised explanation for Current Electricity from the StudyVector tutor. Ask follow-up questions and work through problems with step-by-step support.
Open tutorFree full access to Current Electricity
Sign up in 30 seconds to unlock step-by-step explanations, exam-style practice, instant feedback and on-demand coaching — completely free, no card required.
Try a practice question
Unlock Current Electricity practice questions
Get instant feedback, step-by-step help and exam-style practice — free, no card needed.
Start Free — No Card NeededAlready have an account? Log in
Step-by-step method
Step-by-step explanation
4 steps · Worked method for Current Electricity
Core concept
This topic introduces the fundamental concepts of electric current, potential difference, and resistance. It covers Ohm's law as a special case for ohmic conductors and introduces the concept of resis…
Frequently asked questions
What is the difference between conventional current and electron flow?
Conventional current is defined as the direction that positive charge would flow (from positive to negative). Electron flow is the actual direction that electrons move (from negative to positive). In circuit analysis, we always use conventional current.
How does temperature affect the resistance of a metal conductor?
For a metal conductor, resistance increases as temperature increases. This is because the positive ions in the metal lattice vibrate more, increasing the frequency of collisions with the charge-carrying electrons and impeding their flow.