KS3 Year 9 / Physics / Curriculum

Electricity and magnetism

Electricity and magnetism: structured theory, worked examples, answered practice, and a mastery checklist for KS3 Year 9.

学习目标

Describe “Current, potential difference and resistance” using evidence from observation, measurement, or a model.
Describe “Series and parallel circuits” using evidence from observation, measurement, or a model.
Describe “I-V characteristics introduction” using evidence from observation, measurement, or a model.
Describe “Static electricity” using evidence from observation, measurement, or a model.
Describe “Electric fields in simple form” using evidence from observation, measurement, or a model.

核心概念与检查

I draw and analyse a circuit with correct instruments.
I connect charge, current, voltage, resistance, and power.
Every solution or explanation for “Electricity and magnetism” should include a method, justification, and final check.

单元

核心理论

练习前按清晰顺序掌握本章核心概念。

Charge, current, and potential difference

Charge is a property, current is charge flow rate, and potential difference is energy per unit charge. Keep these definitions distinct.

Circuit and conservation

Draw a closed circuit with correct symbols. Apply charge conservation at junctions and energy conservation around loops where required.

Fields and induction

Field lines indicate direction and relative strength. In induction, changing magnetic flux is linked to induced potential difference.

Current, potential difference and resistance

For “Current, potential difference and resistance”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.

Series and parallel circuits

For “Series and parallel circuits”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.

I-V characteristics introduction

For “I-V characteristics introduction”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.

Static electricity

For “Static electricity”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.

Electric fields in simple form

For “Electric fields in simple form”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.

Physics

例题讲解

逐步查看方法，并理解每一步为何成立。

Worked circuit example

A 7 Ω resistor is connected across 35 V. Find current and power.

1Ohm's law: I = V/R = 35/7.
2Power: P = VI = 35 · 5.
3Check A and W units and that the circuit is closed.

I = 5 A, P = 175 W

Reasoning example

Before calculating, explain the key idea from “Current, potential difference and resistance” and which conditions must be checked.

1Define the idea in one clear sentence.
2Connect it to a representation, law, or formula.
3State a restriction, unit, or final check that makes the solution valid.

The answer should show not only which rule is used for “Current, potential difference and resistance”, but also why it is valid here.

Electricity and magnetism

含答案练习

八道分层练习，从基础熟练到考试应用。请先独立完成，再查看提示或答案。

基础熟练4 分钟

A 6 Ω resistor carries 5 A. Find voltage and power.

提示

V=IR and P=VI.

答案指南

V=30 V, P=150 W.

基础熟练5 分钟

Structure a solution for “Series and parallel circuits”: givens, SI units, law, substitution, and interpretation.

提示

State the law before substituting numbers.

答案指南

A full solution states symbols/units, selects a valid law for “Series and parallel circuits”, shows substitution and calculation, and interprets the result.

应用6 分钟

Identify three uncertainty sources in measuring “I-V characteristics introduction” and improve each one.

提示

Consider instrument resolution, reaction time, repeats, and controls.

答案指南

A full response links each specific error source to a targeted improvement and identifies random or systematic impact.

应用7 分钟

Plan a suitable graph for “Static electricity” data and explain how to obtain a gradient or relationship.

提示

Put the independent variable on x and dependent variable on y.

答案指南

A full response labels axes/units, uses a suitable scale and best fit; gradient uses a large triangle and is interpreted with units.

推理8 分钟

Check whether a result for “Electric fields in simple form” is sensible using units, order of magnitude, and a limiting case.

提示

A check should not merely repeat the same calculation.

答案指南

A full check confirms dimensions/units, compares expected magnitude, and tests behaviour when one variable becomes very small or large.

推理9 分钟

Connect “Electromagnets” to energy conservation or a force/field model and justify the choice.

提示

Define the system and interactions.

答案指南

A full response defines the system, describes transfer or interaction, applies the appropriate model, and states losses or limitations.

考试题型10 分钟

Write a multi-step exam response about “Motor effect introduction” with calculation and evaluation.

提示

Separate givens, model, calculation, result, and evaluation.

答案指南

A full response includes an appropriate diagram/model, laws, algebraic rearrangement, SI substitution, suitably precise result, and evaluation of assumptions.

考试题型12 分钟

Compare two methods for investigating “Generator effect introduction” and select the more reliable using criteria.

提示

Use accuracy, repeatability, control, and safety.

答案指南

The choice must use at least three comparable criteria and acknowledge one trade-off or limitation.

常见错误

Connecting an ammeter in parallel or a voltmeter in series.
Confusing current with voltage or saying current is consumed.
Ignoring direction in force, field, or induction.

掌握度检查

I draw and analyse a circuit with correct instruments.
I connect charge, current, voltage, resistance, and power.
I interpret fields and induction with direction.

Electricity and magnetism

章节作业

六道不同作业，从基础到挑战，包含预计用时、提示和答案指南。

基础8 分钟

Homework 1: A 2 Ω resistor carries 8 A. Find voltage and power.

提示

V=IR and P=VI.

答案指南

V=16 V, P=128 W.

基础10 分钟

Homework 2: Structure a solution for “Series and parallel circuits”: givens, SI units, law, substitution, and interpretation.

提示

State the law before substituting numbers.

答案指南

A full solution states symbols/units, selects a valid law for “Series and parallel circuits”, shows substitution and calculation, and interprets the result.

进阶12 分钟

Homework 3: Identify three uncertainty sources in measuring “I-V characteristics introduction” and improve each one.

提示

Consider instrument resolution, reaction time, repeats, and controls.

答案指南

A full response links each specific error source to a targeted improvement and identifies random or systematic impact.

进阶15 分钟

Homework 4: Plan a suitable graph for “Static electricity” data and explain how to obtain a gradient or relationship.

提示

Put the independent variable on x and dependent variable on y.

答案指南

A full response labels axes/units, uses a suitable scale and best fit; gradient uses a large triangle and is interpreted with units.

挑战18 分钟

Homework 5: Check whether a result for “Electric fields in simple form” is sensible using units, order of magnitude, and a limiting case.

提示

A check should not merely repeat the same calculation.

答案指南

A full check confirms dimensions/units, compares expected magnitude, and tests behaviour when one variable becomes very small or large.

挑战20 分钟

Homework 6: Connect “Electromagnets” to energy conservation or a force/field model and justify the choice.

提示

Define the system and interactions.

答案指南

A full response defines the system, describes transfer or interaction, applies the appropriate model, and states losses or limitations.

50 分钟 / 40 分

完整章节测试

带计时器、完整分值和参考答案的章节自测。

Start the timer when ready, work without notes, show every step, and open model answers only after finishing.

1. A 2 Ω resistor carries 6 A. Find voltage and power.

2 分

答案指南

V=12 V, P=72 W.

2. Structure a solution for “Series and parallel circuits”: givens, SI units, law, substitution, and interpretation.

3 分

答案指南

A full solution states symbols/units, selects a valid law for “Series and parallel circuits”, shows substitution and calculation, and interprets the result.

3. Identify three uncertainty sources in measuring “I-V characteristics introduction” and improve each one.

3 分

答案指南

A full response links each specific error source to a targeted improvement and identifies random or systematic impact.

4. Plan a suitable graph for “Static electricity” data and explain how to obtain a gradient or relationship.

4 分

答案指南

A full response labels axes/units, uses a suitable scale and best fit; gradient uses a large triangle and is interpreted with units.

5. Check whether a result for “Electric fields in simple form” is sensible using units, order of magnitude, and a limiting case.

4 分

答案指南

A full check confirms dimensions/units, compares expected magnitude, and tests behaviour when one variable becomes very small or large.

6. Connect “Electromagnets” to energy conservation or a force/field model and justify the choice.

4 分

答案指南

A full response defines the system, describes transfer or interaction, applies the appropriate model, and states losses or limitations.

7. Write a multi-step exam response about “Motor effect introduction” with calculation and evaluation.

5 分

答案指南

A full response includes an appropriate diagram/model, laws, algebraic rearrangement, SI substitution, suitably precise result, and evaluation of assumptions.

8. Compare two methods for investigating “Generator effect introduction” and select the more reliable using criteria.

5 分

答案指南

The choice must use at least three comparable criteria and acknowledge one trade-off or limitation.

9. Create an extension question about “Current, potential difference and resistance”, a prediction, and a data-collection plan.

5 分

答案指南

A full response gives a testable question, justified prediction, independent-variable range, repeats, and an analysis method.

10. A 5 Ω resistor carries 5 A. Find voltage and power.

5 分

答案指南

V=25 V, P=125 W.

单元

官方来源与核验

课程参考来源；教学顺序请始终与学校和老师确认。

UK Department for Education - ScienceOfficial national curriculum progression and attainment guidance.

Physics

KS3 Year 9: 数学与物理的结构化路线，包含章节、练习和下一步。

返回科目

本章覆盖内容

结构跟随教材，用来帮助组织学习。

Current, potential difference and resistance

Series and parallel circuits

I-V characteristics introduction

Static electricity

Electric fields in simple form

Electromagnets

Motor effect introduction

Generator effect introduction

重点关注

通常容易出错或需要更多复习的部分。

I draw and analyse a circuit with correct instruments.

I connect charge, current, voltage, resistance, and power.

I interpret fields and induction with direction.

来源、日常资料与学习资源

从教材、daily material、PDFs、videos 和 worked examples 开始。

Start from the official textbook or specification referenced on the subject page.

Use the notes and examples as support, not as a replacement for the official syllabus.

Check the current syllabus version before exam preparation.

按小主题练习

进入 full tests 前先做 targeted practice，让覆盖情况更清楚。

A 6 Ω resistor carries 5 A. Find voltage and power.

Structure a solution for “Series and parallel circuits”: givens, SI units, law, substitution, and interpretation.

Identify three uncertainty sources in measuring “I-V characteristics introduction” and improve each one.

Plan a suitable graph for “Static electricity” data and explain how to obtain a gradient or relationship.

Check whether a result for “Electric fields in simple form” is sensible using units, order of magnitude, and a limiting case.

Connect “Electromagnets” to energy conservation or a force/field model and justify the choice.

Write a multi-step exam response about “Motor effect introduction” with calculation and evaluation.

Compare two methods for investigating “Generator effect introduction” and select the more reliable using criteria.

Mocks 与进度检查

如何衡量本章进度，以及何时加入综合 mock。

Start with untimed practice by subtopic.

Move to a short timed checkpoint only after completing the mastery checklist.

Record each error with the correct method and revisit it after 48 hours.

下一步

完成本章后该做什么，以及它如何连接到下一单元。

Complete the practice without support.

Explain the core method aloud in under two minutes.

Continue to the next chapter or request targeted tutor support.

说明：每学年的正式考试范围请始终以学校、老师和当前官方来源为准。

学习目标

Describe “Current, potential difference and resistance” using evidence from observation, measurement, or a model.

Describe “Series and parallel circuits” using evidence from observation, measurement, or a model.

Describe “I-V characteristics introduction” using evidence from observation, measurement, or a model.

Describe “Static electricity” using evidence from observation, measurement, or a model.

Describe “Electric fields in simple form” using evidence from observation, measurement, or a model.

按小主题练习

进入 full tests 前先做 targeted practice，让覆盖情况更清楚。

A 6 Ω resistor carries 5 A. Find voltage and power.

Structure a solution for “Series and parallel circuits”: givens, SI units, law, substitution, and interpretation.

Identify three uncertainty sources in measuring “I-V characteristics introduction” and improve each one.

Plan a suitable graph for “Static electricity” data and explain how to obtain a gradient or relationship.

Check whether a result for “Electric fields in simple form” is sensible using units, order of magnitude, and a limiting case.

Connect “Electromagnets” to energy conservation or a force/field model and justify the choice.

Write a multi-step exam response about “Motor effect introduction” with calculation and evaluation.

Compare two methods for investigating “Generator effect introduction” and select the more reliable using criteria.