There is something that can make an electric current sound for people upstairs to hear. A device called "electronic dog" can make electric current sound, which can be heard by people upstairs. Electronic dog is a kind of pet toy made of electronic components and circuit boards. They can attract the attention of pets by making different sounds and tones. One of the sounds is the sound of electric current, which is similar to the sound of electrostatic discharge or electric current passing through wires. If you want people upstairs to hear the sound of current, you can try using an electronic dog, put it near the upstairs room, and then adjust the volume and frequency so that it can be transmitted clearly upstairs. However, it should be noted that the use of any equipment must comply with relevant laws and regulations, so as not to disturb the people and create noise pollution.