# How resistors really works? [duplicate]

From what I've readed, a resistor is a component which limit the current in a circuit. Supposing that I've a load that is rated for 12v 500mA, if I put a resistor to limit the current to, for example, 100mA what will happen to the load that expect to draw more current? Will it drop more voltage?

• The 12 V will be divided between the two loads. The voltage dropped across each will be proportional to the resistance. See Ohm's Law and potential divider. – Transistor Jun 29 '16 at 15:23
• "a resistor is a component which limit the current in a circuit" That is true only under a very loose interpretation of "limit", and in some develishs circuits the relation might even be reversed. – Wouter van Ooijen Jun 29 '16 at 17:47
• "to limit the current to, for example, 100mA" now you are overinterpreting the term "reduce". A resistor does not reduce the current to a specific value. Cmpare to: I put a brake on the cyclists wheel to reduce its speed to 3 km/h (note that a simple brake will not do that). Now what happens when he hits a wall? Of course his speed will no longer be 3 km/h. – Wouter van Ooijen Jun 29 '16 at 17:49