Sntieecr 6 Set 131 PCS DC Motors Kit, Mini Electric Motor 1.5-3V 15000RPM with 66 PCS Plastic Gears, Shaft Propeller, Bulbs, Buzzer Sounder, Science Experiment Set for Kid DIY STEM Engineering Project

For the price, please just buy it and have a play around with your kids, they learn the simple things which sets them up for success early on, might seem basic to you but my kids had a field day, box is full of fun

Potato battery notesFirst off, if your kid is going to do a potato battery science project know that this is harder than it looks. The LED lights typically require 3 volts and about 20 mA to light them up. sometimes you will get lucky with fewer milliamps, but most require 20 mA. This requires more potatoes and more wires than you might expect. Obviously, results may vary, but don't expect this to work with 1 or 2 potatoes. It took about 12 potatoes (4 in series, 3 in parallel) for my kid's project. Expect it to take at least 4 potatoes. Most of these kits don't have enough wires to connect all the needed potatoes (if you use 12 potatoes as we did). I ordered two different kits, and then later 3 more of a third kit type before we finally succeeded. Also, the larger the surface area of the zinc/copper, the more power output you will get. The rectangular metal pieces seemed to have better electrical properties than the spike-shaped ones. I think they must have increased surface area.Powering a small siren/noise maker or a clock (included in some kits) uses much less power than the LED light. A small non-LED Christmas light takes about 100 mA for full brightness.One of the kits we used came with a single LED that flashes multiple colors. each color using a different amount of current (mA). This was pretty cool. It required about 6 to 20 mA to light up. I used my multi-meter with a store-bought battery to determine how much current (mA) each load (LED light, fan, clock) used.Pro tip: boiling a potato for 8 minutes increases the power output (credit goes to Israeli Researchers)Also: You cannot charge a phone or light a large bulb from a simple potato battery. Those are hoax videos going around the internet.

El dispositivo llego a su destino, viene completo a como indica el vendedor, la calidad del producto es basica para el precio que tiene el producto, los niños lo pueden utilizar facilmente.Seria bueno que la calidad del material del dispositivo sea de mejor calidad.

A great selection of gears and other electric motor supplies for the hobbyist.

Our autistic grandkids have so much fun with these