GCSE Physics - Efficiency #8

In this video we cover:
- The idea that devices aren't 100% efficient
- What efficiency is
- The equation for efficiency
- Examples of how to calculate efficiency
- Why some devices like electric heaters are sometimes considered to be 100% efficient

General info:
- Suitable for all GCSE and IGCSE courses

Exam board specific info:
AQA - Everything is relevant to your course!
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Everything is relevant to your course!
OCR 21st Century - Everything is relevant to your course!
OCR Gateway - Everything is relevant to your course!

[Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are:
- Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown.
- Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on.
- Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like.
- A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts.
- A comprehensive bank of past exam papers, organised both by year, and also by topic.

Amadeus & Tom

[Wojbest_YT]

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[micromillions]

Not going to lie but what my teacher took 2 hours worth of lessons to explain what you did in 5 minutes. You make teaching look easy. Thank you for this.

[mmd_bss]

i thought i was gonna die in the middle of the physics exam .. i watched 27 videos of the physics playlist nonstop ...

i swear to god my brain was digesting stuff i thought they were hard and i did well in the exam

Tysm Cognito I will edit this comment and tell you the results :D

97 outta 100 :>

[takitahmid]

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[sodalii]

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[MrGameManIsCool]

Got a really important science test soon so thanks for this I needed to refresh my knowledge on it all, thankyou :)

[ev_the_pigeon]

I’m in year 9 and yet these videos are so helpful! Thankyou so much cx

[FCBeatz]

Great Video! Really easy to follow and understand! Keep up the brilliant work!

[allroundgamer]

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[sahilmiah]

Finnaly finished this topic energy all you videos help so much thank you.

[sameerkaushal]

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[DiegoDiaz-dmlk]

Why is youtube so much better than the actual lessons?

[oscarpeters]

these videos are so helpful, thank you!!

[joelfoulkes]

Anyone else got this video prepared because there meant to be revising incase ur mum walks in haha

[animegodyt]

not going and lie you actually made this topic sound soo simple

[Arctic]

Thanks for this helpful video! It helped a lot with the understanding of efficiency.

[afnankhan]

ur videos came in clutch for my exams so thanks man

[chloe-etuh]

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[the_techverse]

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