What do you mean by “stable”? DC just means it has a direction. Flow and Voltage can be changing. For example Pulse Width Modulation (PWM) is often used to control DC devices by rapidly providing and cutting electricity from them. Still the current just has one direction.
The meme is “science guy doing science”
The joke is that the DC in “Washington DC” also stands for “Direct Current.” Direct Current is usually stable in a circuit.
What our Punny scientist did is make Washington “Alternating Current.” By creating an oscillating image of the Washington DC buildings.
It’s a very funny shitpost for electronic nerds.
What do you mean by “stable”? DC just means it has a direction. Flow and Voltage can be changing. For example Pulse Width Modulation (PWM) is often used to control DC devices by rapidly providing and cutting electricity from them. Still the current just has one direction.