推荐回答（5个）
一、这是市电的电压和频率，是看不出多少瓦的。 单位是W ，比如50W 、100W 、1000W等二、220v 50hz，是指我国统一标称交流电压220V（国外是110V，如日本等国）频率50赫兹（Hz），即发电机每秒运转50圈
电功率的计算需要用公式P=I^2*R和P=U^2 /R。即电功率需要用电压，电流或电阻中的两个量计算，已知电压和频率无法计算功率。
1. P=W/t 主要适用于已知电能和时间求功率
2. P=UI 主要适用于已知电压和电流求功率
3. P=U^2/R =I^2R主要适用于纯电阻电路
一般用于并联电路或电压和电阻中有一个变量求解电功率
4.P=I^2R 主要用于纯电阻电路
一般用于串联电路或电流和电阻中有一个变量求解电功率
扩展资料
作为表示电流做功快慢的物理量，一个用电器功率的大小数值上等于它在1秒内所消耗的电能。如果在"t"（SI单位为s）这么长的时间内消耗的电能“W”（SI单位为J），那么这个用电器的电功率就是P=W/t（定义式）电功率等于导体两端电压与通过导体电流的乘积。
每个用电器都有一个正常工作的电压值叫额定电压，用电器在额定电压下正常工作的功率叫做额定功率，用电器在实际电压下工作的功率叫做实际功率。
参考资料百度百科-电功率
ac220v 就是 交流电220伏特
50HZ 是50赫兹，工作频率
这个跟多少瓦没有关系，中国的电器和电基本都这样
多少瓦 ，你要看 多少W
只要电压够就可以带起来，我不知道车能提供的电压是多少，
还有根据P=UI， 电流也要够的（这个到不是问题）
“频率50赫兹（Hz），即发电机每秒运转50圈”楼上这句话是错误的。频率（工频）为50Hz，故一对磁极的发电机要求其转速为n=3000r/min，对应50Hz的旋转磁场转速n1=3000r/min；二对磁极的发电机要求其转速为n=1500r/min，对应50Hz的旋转磁场转速。
Hz：赫兹（频率的单位）
Φ：初相
V：伏特简称伏（电压的单位）
V、Hz及Φ是交流电的三要素，交流电的表达式是：e=UmSin(ωt+Φ)
W：瓦特简称瓦（功率的单位）
P=UI只适应于计算直流电路的功率，交流电路有它自己的计算公式：
P=UIcosΦ（cosΦ是功率因数）
所以，Hz和W是不好换算的
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