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P = 10 V
R = ?
U = 230 V
R = U/J
P=UJ
P = UJ
J = P/U
J = 10 / 230 = 1/23 A
R = U/J
R = 230 / 1:23
R = 230 * 23/1
R = 230 * 23 = 5290 OMA.