Need help with part i) of this question. I thought initial current meant t = 0.

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secondary 4 | A Maths
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secondary 4 A Maths Singapore

Need help with part i) of this question. I thought initial current meant t = 0. So I simply subbed that into the equation and could not get the right answer.

This is a topic on exponential and logarithmic functions.

Date Posted: 5 years ago

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5 years ago

Yes you are correct.

Realise that when t = 0,

i = V/R (e^0)
i = V/R (because e^0 = 1)

i = 220/2700 A
i = 0.0815 A (3s.f.)

Clarence Tang

5 years ago

Thanks! Just realised that exponents have priority in order of operations. That's why I couldn't find the answer.

5 years ago

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Date Posted: 4 years ago

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