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===Examples===
{| class="wikitable"
|[[File:OscilloscopeScreenDC1.png|center|290px]]
|[[File:OscilloscopeScreenDC2.png|center|290px]]
| style="height:20px; width:290px; text-align:center;" |This is a constant '''direct current''' from a 3V [[battery]].
| style="height:20px; width:290px; text-align:center;" |This is a fluctuating '''direct current'''.
|-}{| class="wikitable"
|[[File:OscilloscopeScreenDC3.png|center|290px]]
|[[File:OscilloscopeScreenDC4.png|center|290px]]