This depends on the type of vacuum you want to purchase and what your price range is. The department stores might have more affordable models while the appliance store is likely to stock industrial grade brands.
Once can purchase vacuum belts from a variety of locations. These include electrical appliance stores, department stores, and online retailers such as Amazon.
Each of these can be considered an appliance. They might each be called a home appliance.
electrical
First the electricity goes inside the vacuum cleaner, then the vacuum cleaner sucks the dirt right away so therefore: Electrical energy -- Mechanical Energy
A mechanical or electrical.
Electrical energy is transformed to mechanical energy.
Electrical Energy is added to the vacuum cleaner as input. This energy is converted to mechanical energy with heat energy and sound energy being wasted.
A vacuum is nothing. A nothing can't burn, so there is no need to put it out. If you are talking about a vacuum cleaner (electrical appliance) on fire, that is an energized electrical fire, which is a Class C fire. You will need a UL class C rated fire extinguisher for this emergency (i.e., ABC, B:C, or C). If you can unplug the vacuum safely, then do so. This converts the fire from Class C to "ordinary combustibles", UL Class A.
The electrical circuit voltage drops when an appliance is turned on. (Lights dim, etc.) A new circuit is needed or you could purchase a UPS (Uninterrupted Power Supply) to act as a buffer and prevent the voltage drop. JR
Shop vacuum cleaner can be found in larger electrical appliances suppliers or retail sellers. If these sellers do not have such model available or that they do not sell shop-oriented models, it is recommended to check the websites of some major vacuum cleaner manufacturers and call them for details.
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That depends on the distance to the vacuum cleaner. The closer, the louder.