IV Characteristics — GCSE Physics Revision
Revise IV Characteristics for GCSE 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.
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Go to Electric PowerWhat is IV Characteristics?
I-V characteristics describe how the current (I) through a component changes as the potential difference (V) across it is varied. The relationship can be shown on a graph. For an ohmic conductor like a resistor at constant temperature, the graph is a straight line through the origin. For other components, like a filament lamp or a diode, the graph is a curve, showing that their resistance is not constant.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). Higher Tier students are expected to be able to draw and interpret the I-V graphs for a resistor, filament lamp, and diode.
Step-by-step explanationWorked example
An I-V graph for a component is a straight line passing through the origin. When the voltage is 4V, the current is 2A. What is the resistance? Solution: Resistance R = V/I. R = 4V / 2A = 2Ω.
Mini lesson for IV Characteristics
1. Understand the core idea
I-V characteristics describe how the current (I) through a component changes as the potential difference (V) across it is varied. The relationship can be shown on a graph.
Can you explain IV Characteristics without copying the notes?
2. Turn it into marks
An I-V graph for a component is a straight line passing through the origin. When the voltage is 4V, the current is 2A.
Underline the method, evidence, or command-word move that would earn credit in GCSE Electricity.
3. Fix the likely mark leak
Watch for this mistake: Mixing up the axes on the graph. By convention, voltage (potential difference) is on the x-axis and current is on the y-axis.
Write one correction rule before doing another practice question.
Practise this topic
Jump into adaptive, exam-style questions for IV Characteristics. Free to start; sign in to save progress.
IV Characteristics practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one GCSE sentence, explain what IV Characteristics is testing.
Answer: I-V characteristics describe how the current (I) through a component changes as the potential difference (V) across it is varied. The relationship can be shown on a graph.
Mark focus: Precise definition and topic focus.
Question 2
A IV Characteristics 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: "Mixing up the axes on the graph. By convention, voltage (potential difference) is on the x-axis and current is on the y-axis." What should their next repair task be?
Answer: Do one IV Characteristics question and review the mistake type.
Mark focus: Error correction and next-step practice.
IV Characteristics flashcards
Core idea
What is the main idea in IV Characteristics?
I-V characteristics describe how the current (I) through a component changes as the potential difference (V) across it is varied. The relationship can be shown on a graph.
Common mistake
What mistake should you avoid in IV Characteristics?
Mixing up the axes on the graph. By convention, voltage (potential difference) is on the x-axis and current is on the y-axis.
Practice
What is one useful practice task for IV Characteristics?
Answer one IV Characteristics question and review the mistake type.
Exam board
How should you use board notes for IV Characteristics?
Covered by all major boards (AQA, Edexcel, OCR). Higher Tier students are expected to be able to draw and interpret the I-V graphs for a resistor, filament lamp, and diode.
Common mistakes
- 1Mixing up the axes on the graph. By convention, voltage (potential difference) is on the x-axis and current is on the y-axis.
- 2Thinking that all components have a straight-line I-V graph. Only ohmic conductors do. The curved graphs for other components are important to learn.
- 3Misinterpreting the gradient of the I-V graph. The gradient is I/V, which is the reciprocal of resistance (1/R). A steeper gradient means a lower resistance.
IV Characteristics exam questions
Exam-style questions for IV Characteristics with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for IV Characteristics
Core concept
I-V characteristics describe how the current (I) through a component changes as the potential difference (V) across it is varied. The relationship can be shown on a graph. For an ohmic conductor like …
Frequently asked questions
What does the I-V graph for a diode look like?
A diode allows current to flow easily in one direction only. The I-V graph shows very high resistance in the reverse direction (almost zero current) and very low resistance in the forward direction once a certain threshold voltage is reached.
Why is the I-V graph for a filament lamp a curve?
As the voltage across a filament lamp increases, the filament gets hotter. This increases its resistance, so the graph curves, showing that the current increases less for each volt added.