# [S3] Lesson 45 : COE / DC Part 2 + Maxima / Minima + Atmosphere II Updates/Debrief

[S3 Physics PMCians]

What we did in 2 hours:

Last lesson, we learnt how to solve complete circuits using a variety of techniques.

1. Ohm’s law ( V = RI)
2. Potential divider to determine pd for components in series

3. Current divider to determine current for 2 components in parallel

The key to solving circuits fast and effectively is not just memorising the formulas, but also knowing which method to use at the right time.

Also, congrats to those who did well in our 4Q quizzes and earned themselves some PMC dollars! Keep up the good work!

These are solutions for the two 4Q quizzes in case you missed out on them.

https://tinyurl.com/y5sv2ryz

Special Mention:

Next lesson, we are going to have a series of tests and quizzes to consolidate what you have learnt over the past 2 weeks on Electricity. Get ready to earn more PMC dollars!

[S3 Maths PMCians]

What we did in 2 hours:

Last week, we learnt how to apply the techniques of differentiation onto Maxima/Minima problems.

On top of all the mensuration formulae, we discovered how unwanted variable can be replaced so we can differentiate with respect to one variable.

After that, as we have learnt from Nature of Functions in the previous lesson, we can find the stationary value as required and prove that it is a maximum/minimum value.

Sometimes, from the Step 2 in the summary, the equation may not be given directly and can be tricky. Please continue to practise Maxima/Minima problems by trying the Takeaway Questions.

Special Mention:

In the next lesson, we will look at more application of differentiation. We will talk about Connected Rate of Change.

See you in class!

Your friendly PMC S3 Math tutors

[S3 Chemistry PMCians]

What we did in 2 hours:

We have completed our learning on Air & Atmosphere where we learnt to classify certain pollutants (neutral and acidic oxides) and suggest appropriate methods to remove them (i.e. acidic gases can be removed using bases/carbonates, carbon monoxide and NOx in the catalytic converter).

You should now have completed your Take Home Package on Air & Atmosphere. Clarify your doubts, if any, in our very last Headstart lesson this week!

Special Mention:

Prepare yourself for an interactive practical skills training session where we will cover some concepts in qualitative analysis and titration this weekend!

Also, do bring your EOY exam papers over the next two weeks for a quick feedback on your strengths, areas of improvement and receive customised advice/materials for your revision this holiday!

A quick infographic to refresh your memory on qualitative analysis:

Regards,

Mr Jacob

PMC NEW NORMAL

Students can choose to attend any of the timeslots onsite in the respective outlets or live from home at the same timing. There will be both ONSITE and ONLINE audience for all classes. ONSITE and ONLINE students will be able to interact with one another and the tutor will be able to engage both audiences. Both platforms (onsite and online) will be carried out concurrently, ensuring that students in the physical classroom and those attending lessons via Zoom are taught exactly the same content, at the same time, by the same tutor.