I have the following schematic:
Now I want to know the (more or less) exact current flow in my circuit. For this I did the following calculations:
I = V / R
I = 5V / 330 Ohm
I = 0.015A = 15mA
So with what I now know I expect approximately 15mA to flow across all the wires. However, when I try to measure the current flow by placing my multimeter (in series) between the LED and the resistor I measure I = 9.4mA.
This difference of 5.6mA between the calculated 15mA and the measured 9.4mA seems too large to be due to manufactering deficiencies of the parts of the circuit. Therefore I assume I am making some error in my assumptions/logic, but I cannot figure out what. Can someone help me with this?
Thanks in advance.
As per comments/answers I measured the voltage over the LED and the resistor:
- Resistor: 3.18V
- LED: 1.94V
Also the resistor's actual resistance:
- 325 ohm
Now the calculation indeed does make sense: 3.18V/325 Ohm = 9.8mA Which is close enough to the measured 9.4mA.
Thanks everyone for helping out!