I've bought a cheap multimeter and it's not automatic. I've to manually rotate the knob.
I live in North America. AC current is used in my home. Does this mean I can always measure voltage by turning the knob to AC voltage part(to appropriate measurement amount/unit) and measure voltage at two parts of the device's circuit that runs on AC current without burning the fuse of multimeter? or is there any exception?
When should I turn the knob to DC voltage? Is it when a device run on DC power source?
I saw electricians right away turn the knob to AC or DC for measuring Voltage and Ampere and figure this out without any problem.
So a device that runs on DC current it's voltage inside the device will always be measured by rotating the knob to DC voltage and that runs on AC current it's voltage will always be measured by rotating the knob to AC voltage. Is this true? Is this the general rule?