Help electronics beginer
I am trying to learn electronics and have few questions about some confusing stuff:
- If one is measuring current in a circuit, he is supposed to connect the multimeter into the circuit. Ok, how do you measure current in the arbitrary track on the PCB? Are you supposed to cut the track open, just to take one measurement?
- I have bench power supply, on which one can select voltage and current. If I connect toy electro motor it runs nicely. Power supply shows 3V, 0.17 A. But when replace electro motor with 1,800 ohm resistor, no current is drawn. If I insert multimeter between the resistor and terminal, multimeter shows that no current is flowing.
Why there is no current flowing when resistor is connected and there is current when motor is in