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Evan Toh
Oct 251 min read
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Evan Toh
Oct 251 min read
DC Question – Find unknown R, given the voltmeter readings when switch P and Q are closed respectively
Answer : Option A
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Evan Toh
Oct 221 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...
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Evan Toh
Oct 221 min read
2010SPP2Q12 Fuel gauge using variable resistor
Solutions: As the fuel level drops, the float which stays on the fuel surface will descend. The rod which is attached to the float will...
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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 151 min read
2021PPp1q36 DC circuit, which circuit has a potential difference between P and Q
Do you understand why there is a potential difference between P and Q? What if you are to find the potential difference between P and Q?...
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Evan Toh
Oct 151 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...
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Evan Toh
Aug 312 min read
Simple electric circuit set up - with reistance wire on ruler
This simple circuit involves a resistance wire on the meter rule and the use of jockey tapping at different length L on the resistance...
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Evan Toh
Aug 311 min read
How to connect the variable resistor (rheostat)
The variable resistor (rheostat) is a device to control the size of the current by adjusting the resistance on the variable resistor ....
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