【简答题】正弦交流电路中某负载的电压为500V,电流为10A,电压比电流落后30度,则有功功率、无功功率、视在功率分别为多少?
【简答题】. New York Helmsley Hotel New York City, NY KAYAK members are specially offered the New York Helmsmen Hotel, a world – class hotel located in the heart of Midtown Manhattan, within walking distance of...
【简答题】正弦 交流电路中某负载的电流和电压在关联参考方向下分别为: u ( t )= 220 √ 2sin314tV ; i ( t )= 10 √ 2sin ( 314t - 60 O ) A ,则表示它 们的相量(复数)分别为 Ù = V , Ì = A 。
【单选题】在正弦交流电路中,某负载的有功功率P=4千瓦,视在功率S=5千伏安则该负载的功率因数为 ( )。
【单选题】In Canada, the Senate members are appointed from geographic regions while members of the House of Commons are elected by popular vote for a period not to exceed______ years.
【单选题】John is one of the staff members who ___to be sent abroad for further study.
【简答题】A.member government B.members government C.member governments D.members governments
【单选题】The disagreement among the family members ______over with time.
【单选题】在正弦交流电中,某负载为Z=8+j6,则该负载的功率因数为( )。
【单选题】在正弦交流电路中,某负载的有功功率 P=1000W ,无功功率 Q=577var ,则该负载的功率因数为 ( )