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secondary 4 | Physics
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Athl
Athl

secondary 4 chevron_right Physics

Physics question. How to do part b (i )&(ii)

Date Posted: 6 years ago
Views: 598

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Chen Rong
Chen Rong's answer
14 answers (A Helpful Person)
1st
Utilise the V=IR and Q=IT formula.
Athl
Athl
6 years ago
Thanks. So to find the resistance of X, is it
I= 0.5-0.3333=0.167
R=1/0.167

Like this? Why we use the voltage of 1V, and not 2V(given by the battery)
Chen Rong
Chen Rong
6 years ago
The voltage across both the 3ohm resistor and X is 1.0V, not the 2.0V across the battery. There has already been a 1.0v p.d drop across the 2.0ohm resistor, hence the the remaining potential drop across both the 3ohm resistor and X must be 1.0V as explained in the workings. The p.d across X and the 3.0ohm resistor must be the same at 1.0V as they are placed in parallel with one another.
Athl
Athl
6 years ago
Got it! Thanks so much.