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2007PPp1q28 2019PPp1q33 - Which V-I readings are for torch lamp?
2019PPP1Q33 Ans: Option B 2007PPP1Q28 Ans: Option B Torch lamp or bulb is a non-ohmic conductor . The V-I graph has an increasing...
Evan Toh
Oct 25, 20241 min read
2020PPp1q9 moments – Find force P acting on stick by shoulder
Using the concepts that POM, we know 1) Ma = Mc 2) net force on the stick is 0N. Most of us will most likely to take pivot about P as...
Evan Toh
Oct 23, 20241 min read
2016PPP1Q40 – Voltage and Power of Bulb Y when X is switched off - 2013PPP1Q40 heaters
2016PPP1Q40 Solutions: Option C [There is another similar question in 2013 Nov Pure Physics P1Q40. The answer is Option C too. Refer to...
Evan Toh
Oct 22, 20241 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...
Evan Toh
Oct 21, 20241 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,...
Evan Toh
Oct 21, 20241 min read
Evan Toh
Oct 21, 20240 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)...
Evan Toh
Oct 20, 20241 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...
Evan Toh
Oct 16, 20241 min read
2012PPp2q07 - Find the p.d. across A and C
Instead of the usual finding of potential difference across a component, in this question, you are required to find the p.d. across two...
Evan Toh
Oct 15, 20241 min read
PP2017Q11 Using P=I^2R and P=V^2/R to explain which has higher power
Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will...
Evan Toh
Feb 1, 20241 min read
2013PPP1Q30 – Direction of the electric field around a negative charge
Ans: Option A View the video tutorial for the explanation:
Evan Toh
Feb 1, 20241 min read
PP N2010 P1 Q4 Two objects same size and shape but one is heavier. Motion when both released
Solutions: Option C When a body is released from rest, the only force acting on the body is its weight due to gravity . Both bodies...
Evan Toh
Jan 1, 20241 min read
Identifying what lens, focal length and image from 2 rays – PP2010P1Q23 and SP2014P1Q11
These 2 questions are actually the same. Q23 is from 2010 Pure Physics P1 while Q11 is from 2014 Sci Physics P1. Take a look at these 2...
Evan Toh
Jan 1, 20241 min read
Evan Toh
Jan 1, 20241 min read
2017PurePhyP2Q5 Two points on the rope wave with displacement-time graphs given
In this this question, the displacement-time graphs are given, which are different from displacement-distance graphs. In the...
Evan Toh
Jan 1, 20241 min read
Finding specific latent heat of vaporisation (lv) (pure physics)
Take note that the question is looking for specific latent heat of vaporisation during boiling. Hence information of mass m1 before...
Evan Toh
Dec 1, 20231 min read
2007PPP1Q27 brightness of bulb
Solutions: Option B As lamp X is thicker and shorter , these two factors make the resistance of X lower than Y . Recall: Length...
Evan Toh
Dec 1, 20231 min read
N2007P1Q9 Pure Physics – Energy needed to pump water up a building
Answer: Option B Since water will naturally reach 40m high from the bottom of the apartment, you only need to pump the water up by a...
Evan Toh
Dec 1, 20231 min read
2004PPp1q4 2010SPp1q4 Dynamics (3rd law)
Answer: Option D Key concept here is Newton’s 3rd Law. Action equals reaction. Both trolleys are connected by the spring, hence the...
Evan Toh
Dec 1, 20231 min read
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