snell's answer to xy's Secondary 4 A Maths Singapore question.
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see this helps.
it is to see the effect of area change on resistance AND the effect of length change on resistance.
my guess is:
u r confused over radius change or the square effect.
the critical thing is not radius change, but Area change, and the effect that area change on resistance
it is to see the effect of area change on resistance AND the effect of length change on resistance.
my guess is:
u r confused over radius change or the square effect.
the critical thing is not radius change, but Area change, and the effect that area change on resistance
Date Posted:
5 years ago
if u still r confused over anything, dun worry, just feel free to ask.
u got the basics.
r doubles, area increases by 4 times,
so resistance decreases by 4 times
length doubles,
resistance doubles.
if u can see,
radius change is more complex
than length change.
u got the basics.
r doubles, area increases by 4 times,
so resistance decreases by 4 times
length doubles,
resistance doubles.
if u can see,
radius change is more complex
than length change.
Why need to consider area? Because question never say anything about area.
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