表中所示是某品牌电热水壶的铭牌,根据铭牌给出的信息,求；

1、I = P/U = 880 / 220 A = 4 A
2、R = U²/P = 220² / 880 Ω = 55Ω
3、W = pt = 880 ×10×60 J = 528000 J = 5.28 ×10^5 J