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Relation between interest rates and currency for a nation
What you are asking about is called Interest Rate Parity. Or for a longer explanation the article Interest Rate Parity at Wikipedia.  If the US has a rate of say zero, and the rate in Elbonia is 10%, one believes that in a year the exchange rate will be shifted by 10%, i.e. it will take 1.1 unit of their currency to get the dollars one unit did prior.  Else, you'd always profit from such FOREX trades.  (Disclaimer - I am not claiming this to be true or false, just offering one theory that explains the rate difference effect on future exchange rates.