Multiplex switches

I²R said:

It's simple. Consider a 20 kOhm resistor in series with a 5 kOhm resistor, with 10 V applied across them. You want to determine the voltage at the point between them. First thing you do is calculate the current through the resistors:

I = V / R

I = 10 / (15 k + 5 k)

I = .5 mA

Now that you know that, you can calculate the voltage drop across each resistor:

V = I x R

V1 = .5 mA x 15 k

V1 = 7.5 V

V2 = .5 mA x 5 k

V2 = 2.5 V

Reality check: the two voltages should sum to the total supply voltage. 7.5 + 2.5 = 10. If you have more than two resistors, you can just extend this process. Now, work out your voltage drops.

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