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11.2. Power Generation and Transmission

Here we look at some important principles in Electrical Engineering, including diving into a bit more depth into alternating current. But before we start, why do we use alternating current rather than direct current for our mains electricity?

Let's begin with a bit of historical context. In the late 19th century there was a rivalry between the proponents of alternating current (notably Nikola Tesla) versus those who believed in the use of direct current (led by Thomas Edison). Both factions were competing to get widespread acceptance for electric lighting. The rivalry ended up in both factions trying to discredit each other as being more dangerous, culminating with the invention of the electric chair to demonstrate the dangers. One notable victim of this 'war of currents' was an elephant called Topsy, electrocuted in front of a live audience. Learn more about the story behind the 'war of currents' below:

There is quite a lot in this section, it has been split up as follows:

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AC Generators

AC Generators

You may be somewhat familiar with how an AC generator functions. Essentially they all function on the principle of a coil of wire rotating in a magnetic field, thereby inducing an EMF. However, now that we are familiar with the idea of flux and flux linkage, we can further our understanding of how these generators work.

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Video Lessons

 Chris Doner AC Generators IB Specific Science Shorts AC Generators Back EMF not part of IB

Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Mr. G 11.2 Teaching Notes 11.2 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes B Field Flashcards A Level Resources - content slightly different

Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.2 (Power Generation) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Mr. G 11.2 Formative Assessment Topic 11 Summary Qs IB Specific Questions Physics and Maths Tutor EM Induction (AQA 1) EM Induction MS (AQA 1) A-Level Qs: overlapping content
RMS Current and Voltage

RMS Current and Voltage

What is the average power of an alternating current?

Video Lessons

 Chris Doner RMS Current IB Specific Science Shorts AC Current

Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Alternating Current Level 5/6 Beyond IB Mr. G 11.2 Teaching Notes 11.2 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes B Field Flashcards A Level Resources - content slightly different

Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.2 (Power Generation) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Mr. G 11.2 Formative Assessment Topic 11 Summary Qs IB Specific Questions Physics and Maths Tutor Alternating Current (WJEC) Alternating Current MS (WJEC) Alternating Current (AQA 2) Alternating Current MS (AQA 2) A-Level Qs: overlapping content Physics and Maths Tutor Alternating Current (AQA 1) Alternating Current MS (AQA 1) A-Level Qs: overlapping content
Transformers

Transformers

We were originally introduced to transformers in GCSE. They are particularly useful as they alow an alternating current to be 'stepped up' (voltage increased), or 'stepped down' (voltage decreased) as necessary. We need to have a bit of a look back at those transformer equations.

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Transformers are normally very efficient (over 95%) - so we have previously looked at transformers with no power loss (i.e Power in = Power out). In reality there are energy losses associated with transformers, so where do these come from?

Video Lessons

 Chris Doner Transformers Power Transmission IB Specific Cowen Physics Transformers Science Shorts Transformers

Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Isaac Physics Transformers Mr. G 11.2 Teaching Notes 11.2 Student Notes Physics and Maths Tutor Fields Definitions Fields Key Points Fields Detailed Notes B Field Flashcards A Level Resources - content slightly different

Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.2 (Power Generation) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Isaac Physics Transformers Mr. G 11.2 Formative Assessment Topic 11 Summary Qs IB Specific Questions Physics and Maths Tutor Transformers (AQA 2) Transformers MS (AQA 2) A-Level Qs: overlapping content
Rectification

Video Lessons

 Science Shorts AC Rectification Intro

Resources

 IB Physics Topic 11 Notes IB-Physics.net Chapter 11 Summary IB Revision Notes Mr. G 11.2 Teaching Notes 11.2 Student Notes

Questions

 Cambridge University Press Topic 11: MCQs CUP Website Link Freely available online Grade Gorilla 11.2 (Power Generation) MCQs Topic 11 (Induction) Final Quiz Quick IB Specific Mixed MCQs Mr. G 11.2 Formative Assessment Topic 11 Summary Qs IB Specific Questions