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## Homework Statement

Hi guys,

I've been trying to solve these two questions for the last hour and can't seem to find the solution, any help would be very much appreciated.

**1.**An RC circuit is given a step voltage (charging) of V at t = 0 seconds. What is the value of voltage at t = 2RC?

**2.**If the conductance of a single ion channel is 1pS and its capacitance per cm2 is 1mF and the time constant for a human neuron is 1ms:

**(a)**What is the resistance per cm2 of a neuronal membrane?

**(b)**How many ion channels on average must there be in one µm2 of neuronal membranes?

## Homework Equations

T = RC

Tau = Resistor x Capacitor

## The Attempt at a Solution

1. Tried attempting this question for a solid hour and not sure where to begin.

2.

(a) 1 x 10^-3ms = R x (1 x 10^-6F)

R = 1000W per cm2

(b) I know to divide the total current by the single current but I can't seem to find the solution to identify the total current.