I don't think there's any difference in meaning, although "free of charges" is much less common than "free of charge". Regarding your second question about context: given that English normally likes to adopt the shortest phrasing possible, the longer form "free of charge" can be used as a means of drawing attention to the lack of demand for ...
8 "Free" and "on the house" both mean that you don't have to pay, but the inferred meaning is slightly different. If something is "free" it is without charge. For example, you might receive a voucher through the mail that says you are entitled to a free drink if you hand the voucher in at a bar.
I want to make a official call and ask the other person whether he is free or not at that particular time. I think asking, “Are you free now?” does't sound formal. So, are there any alternatives to...
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Burrell High School profiles students — but not in the way you might think. All students take a survey at the beginning of the year that asks what motivates them, how they learn best, their strengths, ...
1 ' Free ' absolutely means 'free from any sorts constraints or controls. The context determines its different denotations, if any, as in 'free press', 'fee speech', 'free stuff' etc.
For example, imagine some food company decides to make their fruits permanently free. Online, you can "order" them (for free), but in person, what do you do? What would be the professiona...