<https://www.factoryforward.com/product/grove-electromagnet/#product>
<http://schema.org/description>
"An electromagnet is a type of magnet in which the magnetic field is produced by electric current. An electric current flowing in a wire creates a magnetic field around the wire, due to Ampere's law(see drawing below). To concentrate the magnetic field, in an electromagnet the wire is wound into a coil with many turns of wire lying side by side. The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. Grove - Electromagnet can shuck 1KG weight and hold on. it easy to use, to learn electromagnet principle.\r\n\r\nFeatures \r\n\r\n \tGrove shape\r\n \t1KG peak suction\r\n \tLow standby current\r\n\r\n Specification \r\n\r\n \tWorking Voltage ：DC 5V\r\n \tWorking Current ： 400mA\r\n \tStandby current ： 200uA\r\n \tLoad Weight： 1KG"
<https://www.factoryforward.com/product/grove-electromagnet/>