In a circuit such as the following:
The current is the same through all the resistors and is:
V = IReq 9 = I (R1 + R2 + R3) 9 = I (100 + 300 + 50) 9 = I * 450 I = 9/450 or 1/50 Amps
Why is this the case though? For example, why wouldn't there be three or four or two current running through the circuit? Why is all the current equalized with the circuit? Note that I'm looking more into the why (perhaps physics?) behind why this happens and not just so much a link to Ohms law or something.