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The currency of Poland is Polish Zloty (PLN, symbol zł). One Polish Zloty is divided into 100 groszy.
Coins - zł1, zł2, zł5, 1gr, 2gr, 5gr, 10gr, 20gr, 50gr
Banknotes - zł10, zł20, zł50, zł100, zł200
Electrical sockets (outlets) in Poland follows European standard and supply electricity at 220 volts at 50 cycles (AC). If you travel from outside Europe you will need an adapter WA-9 Travel Plug Adapter for Europe ("Type F" CEE 7/7 Schuko).
Some interesting sites
ISAAC special interest group on Clifford and Quaternionic analysis - mirror