So, the electromagnet is actually a circuit with a voltage source and a coil of conducting wire. As you increase the number of windings, you increase the strength of the electromagnet. Electric Current and Voltage in Circuits Electric devices are described in terms of the voltage and current necessary in their operation. A circuit is a complete loop of conducting material. A flashlight circuit on up to the complex circuits in a computer may be described in terms of their voltage and current.
Electric current is actually the flow of electric charges around the circuit.
When the circuit is cut or opened the current will stop flowing. Voltage is just like the force of water pressure pushing water through pipes, only it is pushing charge through conductors. Batteries in a flashlight push charge around the circuit whose main component is the bulb. The bulb acts as a resistance to the current and heats up until the small wire glows brightly. Your design may also include batteries to push current through a circuit and the most important component may be a solenoid.