This is for calculating the load for a power source. Suppose I have a 50 V DC source with an output resistance of 10 ohms (let's consider a purely resistive situation). Now, what will be the current through the circuit if I connect this source to a 100-ohm resistor via a 50-ohm BNC-BNC coaxial cable? Will it be \[ \frac{50 V}{10+50+100} \] or \[ \frac{50 V}{10+\frac{50*100}{50+100}} \] ?