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Evan Toh
Oct 211 min read
Using P = I^2R and P = V^2/R to explain which component uses the highest power or energy.
Instead of P = IV to explain, it might be easier to explain using P = I^2R when the components are connected in series where current I is...
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Evan Toh
Oct 211 min read
When a thermistor is connected in series with a fixed resistor, how to explain the p.d. varies as resistance temperature changes?
When two components are connected in series, where one is a fixed resistor and the resistance of the other can vary (e.g. thermistor,...
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Evan Toh
Oct 211 min read
Basic Concepts on DC Circuit – River System
The ‘D.C.’ here mean direct current . It means that the current flows in one direction in the circuit . The direction of the direct...
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Evan Toh
Oct 211 min read
Factors that affect the resistance of a conductor
In general, assuming temperature of a conductor is constant, the resistance of a conductor is affected by 1) length (L) – [L increases, R...
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Evan Toh
Oct 211 min read
What is Total Internal Reflection (TIR)?
Overview of Total Internal Reflection (TIR) Explanation of the various stages:
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Evan Toh
Oct 201 min read
Video 02 Finding resultant force from vector diagram provided
(1) 2003PPq1q7 (0 min to 2.42 min) Ans: Option A (2) 2023PPp1q4 (2.47 min 3.54 min) Ans: Option C (3) 2018PPp1q2 (3.45 min to 6.22 min)...
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Evan Toh
Oct 201 min read
Video 01 How to find resultant force of two or three forces (without drawing vector diagram)
Below are some examples of questions that involve finding the resultant force due to two or three forces. Below are the questions in the...
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Evan Toh
Oct 160 min read
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Evan Toh
Oct 161 min read
Balancing Toys
There are two main types of balancing toys. Type 01: CG below the pivot point Type 02: CG above the pivot
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Evan Toh
Oct 161 min read
Turning Effect of Forces – Basic Concepts
This video goes through the basic concepts that is required for moment questions. Go through the whole video to have know the different...
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Evan Toh
Oct 161 min read
2015 PurePhy P1Q6 – Using Newton’s 3rd Law to find Forward Thrust
Refer to this MCQ from PurePhysics 2015P1Q6 Answer: Option C
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Evan Toh
Oct 161 min read
Action-Reaction: Newton’s 3rd Law
Take note how to phrase the action-reaction pair, and also the differences and similarities of a action-reaction pair.
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Evan Toh
Oct 161 min read
Direction of Frictional Force on Tyre or Wheel
For these type of questions, it is important to identify which tyre/wheel is connected/powered by the engine or the person. On each tyre...
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