To determine whether a voltage/current is an AC signal or DC one

[abdulbadii]

How can we determine whether a voltage/current is an AC wave/signal or
DC signal by use of DMM aided with other basic/simple kits ?

 

[MaxHeadRoom78]

A DC signal will only pass a current one way if a diode is used to test.
AC will conduct either way.
.

 

[alec_t]

You could also try taking your current/voltage reading via a capacitor in series with the DMM. The capacitor will block DC.

 

[unclejed613]

stick two bare copper wires into a freshly cut potato about an inch apart. if it's DC a green spot forms around the negative wire, if it's AC green spots form around both wires

 

[Nigel Goodwin]

stick two bare copper wires into a freshly cut potato about an inch apart. if it's DC a green spot forms around the negative wire, if it's AC green spots form around both wires

I like that!

 

[danadak]

Magnitude, range, frequency, waveshape of signal has impact on solution to use, what are these
values ?


Regards, Dana.