Science - Combined - 0653 CIE

Electrical Quantities

Muhtasari

Rub a balloon on your hair and it sticks to the wall; that tiny transfer of electrons is the same electric charge that, made to flow, powers everything from a torch to a city. Charge, current and the fields around charges are the starting point of all electricity.

In this lesson you will learn about positive and negative charge, how friction charges objects by moving electrons, the difference between conductors and insulators, and how current is the flow of charge. You will use the equation \(Q = It\), describe electric fields and distinguish direct from alternating current.

Malengo

[Core] State that there are positive and negative charges
[Core] State that positive charges repel other positive charges, negative charges repel other negative charges, but positive charges attract negative charges
[Core] Distinguish between electrical conductors and insulators and give typical examples
[Supplement] State that charge is measured in coulombs

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Maelezo ya Somo

Electric charge and current underpin every circuit you will ever study. Getting the basics exactly right, that charging is a transfer of electrons and that current is the rate of flow of charge, makes circuit work later much easier. The equation \(Q = It\) is a guaranteed calculation.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Electrical Quantities. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

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Two negatively charged objects placed near each other will: A. attract B. repel C. do nothing D. become neutral Answer: B
When an object is charged negatively by friction, it has: A. gained protons B. gained electrons C. lost electrons D. lost neutrons Answer: B
A current of 4 A flows for 10 s. The charge that passes is: A. 0.4 C B. 2.5 C C. 40 C D. 14 C Answer: C
Conventional current is taken to flow: A. from negative to positive B. from positive to negative C. in both directions at once D. only in insulators Answer: B
Metals conduct electricity because they contain: A. free electrons B. free protons C. no charges D. only positive ions that move Answer: A

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Physics Coursebook

Manukuu: Third edition

Mchapishaji: Cambridge University Press

Mwaka: 2021

ISBN: 978-1-108-88807-3

Maelezo: Endorsed coursebook with full coverage of the 0625/0972 syllabus, worked examples and practical skills.

Cambridge IGCSE Physics

Manukuu: Third edition

Mchapishaji: Hodder Education

Mwaka: 2014

ISBN: 978-1-4441-7642-1

Maelezo: Endorsed textbook covering the Core and Supplement content with worked examples and questions.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Electrical Charges, Conservation of Charge, and Transfer of Charge OpenStax · Physics
Describe positive and negative electric charges

"Physics: Electrical Charges, Conservation of Charge, and Transfer of Charge" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/18-1-electrical-charges-conservation-of-charge-and-transfer-of-charge. Access for free at https://openstax.org/books/physics/pages/1-introduction
Sehemu ya kitabu Coulomb's law OpenStax · Physics
Describe Coulomb’s law verbally and mathematically

"Physics: Coulomb's law" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/18-2-coulombs-law. Access for free at https://openstax.org/books/physics/pages/1-introduction

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