In order to get from a current of, one must use a resistance of R ohm,
Using the Ohm's law,
V = IR
Say, V = 3Volt (from the question), I = 30mA
Put in Ohm's law,
3 = 30 * 10 ^-3 * R
R = 3 / 30 * 10^-3
= 100 ohm
Hence the minimum resistance is, R = 100 ohms to get a signal of V = 3 Volt from I = 30mA,
Using a resistance of less than this value will lower the value of the signal.
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