一个简单的物理题(in english)A heater used on a 250V mains circuit(电路) has a 5A fuse(保险丝) in its plug(插头).which is the hightest power rating for this heater?A 50W B 250W C 1000W D 2000W

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一个简单的物理题(in english)A heater used on a 250V mains circuit(电路) has a 5A fuse(保险丝) in its plug(插头).which is the hightest power rating for this heater?A 50W B 250W C 1000W D 2000W
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一个简单的物理题(in english)A heater used on a 250V mains circuit(电路) has a 5A fuse(保险丝) in its plug(插头).which is the hightest power rating for this heater?A 50W B 250W C 1000W D 2000W
一个简单的物理题(in english)
A heater used on a 250V mains circuit(电路) has a 5A fuse(保险丝) in its plug(插头).
which is the hightest power rating for this heater?
A 50W B 250W C 1000W D 2000W

一个简单的物理题(in english)A heater used on a 250V mains circuit(电路) has a 5A fuse(保险丝) in its plug(插头).which is the hightest power rating for this heater?A 50W B 250W C 1000W D 2000W
P=UI=250*5=1250 W
1000W<1250W
选择:C.