Question

Given a ±30 mA current limit for a function generator, what is the smallest resistor you can put across the function generator and still get a士3V signal?

Answer 1

In order to get $\pm 3V$ from a current of,$\pm 30 mA$ 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.