It is possible to connect an electrical device to a circuit so that electrical current will flow through a device. This current will transmit electrical energy to make the device do something that we want it to do. Electrical devices can be very simple. For example, in a light bulb, current carries energy through a special wire called a filament, which makes it glow. Electrical devices can also be very complicated. Electrical energy can be used to drive an electric motor inside a tool like a drill or a pencil sharpener. Electrical energy is also used to power modern electronic devices, including telephones, computers, and televisions.