A stereo, or radio is a device for playing recorded music from tapes, CDs, or listening to music that is broadcasted through the air on radio waves.
Ris forRefrigerator
Ris forRemote control
A remote control is a device that makes other devices work without having to get up and press the buttons on them. You can change the channel on your television with a remote control.
Remote controls work by sending a signal in a beam of invisible light to the device they control. The device has a sensor on it so it can 'see' that light. This is why remote controls work best when there is nothing in between the remote control and the thing you are trying to control.
A robot is a mechanical device that appears to be able to move around and do things by itself. Robots are usually programmed by a computer so this is not strictly true. Robots are mainly used as toys, in factories, and to go places that people cannot go, like deep underwater or on other planets.
A scaffold is a framework that people stand on while they are building or repairing a tall structure. In some countries the frame of scaffolding is made from bamboo, but it is more commonly made from steel or aluminium. Scaffolding has platforms that can support people, tools and building materials. Some scaffolding is so small you can use it to paint the walls inside your house, and some is several storeys high. Using scaffolding is much safer than using a ladder.
Sis forScales (device)
Scales are a device used for measuring how heavy something is. There are many different types of scales. Originally scales were made to balance like a seesaw, and you put the thing you wanted weighed on one side and weights on the other side until it balanced out.
Today, scales are often digital and need batteries to work. There are scales you stand on so you know how much you weigh, kitchen scales like in the picture so you can weigh food, and really big industrial scales to weigh trucks full of grain so it can be sold by weight.