10k resistor across a 5v supply. The voltage would be 5v with a little current, stick something into that circuit and now the voltage will drop... by decreasing the resistor's vale eg 10k to a lower value, as the current rises so to will the voltage so what causes the voltage to change? how come …

Resistors, Voltage vs Current

PapaG February 13, 2013, 4:29pm 11

And the suggestions are getting better and better, e.g. SH45.

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