2007PPp1q28 2019PPp1q33 - Which V-I readings are for torch lamp?

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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 231 min read

2024 Specimen Paper 6091 P1 Q30 Filament bulb graphs

When comes to filament lamp, the non-ohmic characteristic properties comes to mind. But for this quesitons, you have to understand that...

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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

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

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) â€“ [L increases, R...

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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

Dec 31, 20231 min read

Finding total effective resistance

For resistors connected in series, the total resistance is the sum of all resistance. Re = R1 + R2 + R3 For resistors in parallel, the...

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Evan Toh

Nov 30, 20231 min read

What is the current in wire OP? Is it flowing from O to P or P to O?

Solutions: Option B Whatever that goes in has to come out. With this basic concept, you will be able to solve this question easily....

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Evan Toh

Nov 30, 20231 min read

Modification to ammeter to measure bigger current

Sensitivity of the ammeter means that how small a current the ammeter can measure. Example, if the original set up is 0.2 A per division,...

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Evan Toh

Nov 30, 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...

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Evan Toh

Nov 30, 20230 min read

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Evan Toh

Nov 30, 20231 min read

Finding effective resistance when a wire is bent into different shapes

The concepts needed to solve such questions Length increases, resistance increases and vice versa. Finding resistors in parallel and in...

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Evan Toh

Nov 30, 20230 min read

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