Almost every electrical  appliance has a fuse whether it 's a dishwasher or a low wattege lamp.they're an important sefety  device and protect both you and the electrical device. if a fault develops ,the fuse blows and cuts off the electrical supply. in many instances,when a fuse blows, there isn't anything  wrong with the device; it's simply that the fuse has gotten worn and needs replacing.if you find yourself  in a situation where  a fuse has blown and you don't have any replacements ,you can easily make a temporary fuse  using multi - ampere fuse wire .