12 Like drills, soldering irons can be cordless. Cordless soldering irons sometimes use a gas catalytic heater to reach the temperature needed to melt the solder. The name reciprocating is due to this particular back-and-forth movement of the saw. chuck: mandrino grinder: smerigliatrice right angle: angolo retto solder: stagno, lega per saldare workbench: tavolo di lavoro 34 COMMON GROUND ELECTRICAL TOOLS Together with hand tools, electricallyoperated tools are widely used by workers in the electrical or mechanical field. Electrical tools are generally operated by an internal electrical motor or by a resistance which creates heat. They are usually available in the corded or cordless version: corded tools are bigger and more powerful than cordless ones, on the other hand, cordless tools are portable, lighter, and can be used everywhere. Power drill It is a device that can rotate either a drill bit to make holes, or a screwdriver tip to drive screws. A power drill has a handle, an on/off switch, and a chuck that holds the drill bit in place. The rotation speed and direction of the drill bit can be managed by different control devices. Power drills can be corded or cordless, in this case they are fed by batteries placed inside the handle. Soldering iron A soldering iron is made up of a metal tip mounted on an insulated handle. It is used for joining metal parts together by heating and melting a specific paste, called solder. When melted, solder is put between the parts that need to be attached and joins them by becoming hard after it has cooled down. Reciprocating saw A reciprocating saw is a small saw, made up of a handle and a toothed blade. The cutting action is performed by the forward and backward movement of the blade . This tool usually has variable speeds, and it can be used both horizontally and vertically. Angle grinder An angle grinder, or disc grinder, is an electrically operated hand tool used for grinding surfaces. It is powered by an electric motor driving a rotating head placed at a right angle to the handle, on which an abrasive disc is mounted. The rotating speed of the head and the disc is generally adjustable. Sander It is a power tool used to smooth surfaces by abrasion with sandpaper. Sanders have a circular head where the sandpaper is attached and a plastic case which allows for manual use or for fixing it to a workbench.