My lights dim when I turn on a powerful electrical device - vaccuum, TV, CPU, Etc.?

Is this dangerous? Will it lead to my electrical box overheating? Would it be a good idea to upgrade my circuit box? I'm a new homeowner, so alot of this stuff is new to me. How much would I expect to spend if I wanted to upgrade the houses electrical? Its a 1160 sq. ft single story home, with a 2 car... show more Is this dangerous? Will it lead to my electrical box overheating? Would it be a good idea to upgrade my circuit box? I'm a new homeowner, so alot of this stuff is new to me. How much would I expect to spend if I wanted to upgrade the houses electrical? Its a 1160 sq. ft single story home, with a 2 car detached garage.
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