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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 ....
Evan Toh
Aug 31, 20241 min read
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Setting up the electrical circuit and Finding unknown resistor R
Refer to the video below for the setting up of the apparatus. Why do you need a variable resistor (rheostat)? Without the variable...
Evan Toh
Aug 31, 20241 min read
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Evan Toh
Aug 31, 20240 min read
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2021SPp2q8 - Which appliance uses most energy (using P = V^2/R to explain)
Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will...
Evan Toh
Jan 31, 20241 min read
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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
Jan 31, 20241 min read
6 views
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PP2008Q11OR Thermistor in series with fixed resistor, explanation on pd and graph
As both the fixed resistor and the thermistor are connected in series, the sum of potential difference across them will be equal to the...
Evan Toh
Dec 31, 20231 min read
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Evan Toh
Dec 31, 20230 min read
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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....
Evan Toh
Nov 30, 20231 min read
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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,...
Evan Toh
Nov 30, 20231 min read
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Evan Toh
Nov 30, 20230 min read
27 views
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Which 2 junctions to connect to ahieve greatest resistance?
Based on individual calculations, the highest effective resistance will only be achieved if the junctions are connected at Q and S.
Evan Toh
Nov 30, 20231 min read
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