1.Resistance of 110W on 220V:
1.当功率为110W、电压为220V时的电阻值:
2.Ohm’s law for resistance:
2.欧姆定律中关于电阻的公式:
3.Resistance at 120V, 10A:
3.导体直径加倍后的新电阻值:
4.What is the phase angle separation in a standard three-phase system?
4.在标准三相系统中,各相之间的相位角间隔是多少?
5.If phase-to-neutral voltage is 2400V in a Y system, what is phase-to-phase voltage?
5.如果在Y型(星形)系统中,相-中性点电压为2400V,那么相间电压是多少?
6.A 120/240V transformer must be grounded at which point?
6.一台120/240V的变压器必须在哪个点进行接地?
7.In an older 240/120V system, where should the transformer grounding connection be made?
7.在较旧的240/120V系统中,变压器的接地连接应设置在何处?
8.What continuous load wattage is allowed on a 12-gauge branch circuit?
8.在12号线规(12-gauge)的支路回路上,允许承载的连续负载功率是多少?
9.What is the maximum support spacing for EMT conduit in a straight run?
9.对于直线敷设的EMT导管(薄壁金属导管),其最大支撑间距是多少?
10.According to code, what is the minimum vertical clearance above ground for a service drop under 600V?
10.根据规范要求,对于电压低于600V的进户线(service drop),其距地面的最小垂直净空高度是多少?