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

abdulbadii

New Member
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

Well-Known Member
Most Helpful Member
A DC signal will only pass a current one way if a diode is used to test.
AC will conduct either way.
.
 

alec_t

Well-Known Member
Most Helpful Member
You could also try taking your current/voltage reading via a capacitor in series with the DMM. The capacitor will block DC.
 

unclejed613

Well-Known Member
Most Helpful Member
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
 

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