- A machine is a piece of equipment that uses power to do a particular job. It is usually large and stays in the same place
- You use the words device and gadget especially when you think the equipment is very cleverly designed. A device is a piece of equipment that does a particular job, for example takes measurements or controls the operation of a machine. It may use electrical power or be used by hand
- A gadget is a small piece of equipment that does something useful or impressive
- An appliance is a piece of electrical equipment used in your home such as a washing machine or fridge. This word is used especially by the companies that produce and sell them
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