解：?$(1)$?消耗電能?$265.0\ \mathrm {kW·h}-262.0\ \mathrm {kW·h}=3\ \mathrm {kW·h}$?
?$ (2)P_{ }=U_{ }I_{ }={ 220}\ \mathrm {V}×{ 4.5 }\ \mathrm {A}={ 990 }\ \mathrm {W}=0.99\ \mathrm {kW}$?
?$ t_{ }=\frac {W_{ }}{P_{ }}=\frac {{ 0.033 }\mathrm {kW·h}}{{ 0.99 }\mathrm {kW}}={ \frac 1{30} }\ \mathrm {h}=120\ \mathrm {s}$?
