解题思路:
(1)根据
P
=
U
I
求出电饭锅正常工作时的电流;
(2)根据
I
=
求出电阻;
(3)根据
W
=
P
t
求出电饭锅消耗的电能。
(1)
∵
P
=
U
I
∴
正常工作时电流:
I
=
=
=
5
A
;
(2)
∵
I
=
∴
电阻:
R
=
=
=
44
Ω
;
(3)
∵
P
=
∴
正常工作
30
min
消耗的电能:
W
=
P
t
=
1.1
kW
×
0.5
h
=
0.55
kW
⋅
h
,
5;44;0.55
<>
解题思路:
(1)根据
P
=
U
I
求出电饭锅正常工作时的电流;
(2)根据
I
=
求出电阻;
(3)根据
W
=
P
t
求出电饭锅消耗的电能。
(1)
∵
P
=
U
I
∴
正常工作时电流:
I
=
=
=
5
A
;
(2)
∵
I
=
∴
电阻:
R
=
=
=
44
Ω
;
(3)
∵
P
=
∴
正常工作
30
min
消耗的电能:
W
=
P
t
=
1.1
kW
×
0.5
h
=
0.55
kW
⋅
h
,
5;44;0.55
<>