[]https://i.imgur.com/wvwu143.jpg[][]https://i.imgur.com/7DBwYyI.jpg[][]https://i.imgur.com/Hys4QbQ.png[]
Sounds like you think the Eruptors are Antminer U1s to be running at 1.6G/hash each - did they get sold to you as 1.6 G/hash capacity or is that your own mistake? Being scammed seems to be the common issue with BTC atm.
With these block erupters if you're only wanting to learn they are fine - 2.5w x4 is hardly going to make a massive dent in your elec bill - swap out a standard bulb for an energy efficient one and you've pretty much saved the amount of electricity - its when you're burning 4kw and not making a profit that it'll become an issue.