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# Transposition help watch

1. I have the equation v=V(1-e^(t/T)) where v is instantaneous voltage, V is the voltage supply, t is the time, T is the time constant, e is eulers constant.

I know that V is 5V and T is 4.7, and the value of t can be anything, let's say 20 milliseconds.

How would I get e by itself? I know it's probably quite simple but I would very much appreciate it if someone could point me in the right direction, thank you.
2. (Original post by simon 2538)
I have the equation v=V(1-e^(t/T)) where v is instantaneous voltage, V is the voltage supply, t is the time, T is the time constant, e is eulers constant.

I know that V is 5V and T is 4.7, and the value of t can be anything, let's say 20 milliseconds.

How would I get e by itself? I know it's probably quite simple but I would very much appreciate it if someone could point me in the right direction, thank you.
You don't need to "get e by itself" because e is just a constant - approximately 2.718.

In most situations you will know t and want to find v, or know v and want to find t
3. (Original post by davros)
You don't need to "get e by itself" because e is just a constant - approximately 2.718.

In most situations you will know t and want to find v, or know v and want to find t
Thank you very much, that's a real help 😊

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