Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。
The useful power in ac circuit also depends on the current and voltage in the circuit.
交流电路中的有用功率还取决于该电路中的电流和电压。
Through simulation and measuring, a corresponding state locus diagram and a voltage and current waveform and output characteristics are thus made, from which a useful conclusion is reached.
作出对应的状态轨迹图，通过仿真和实测，求出相应的电压、电流波形及输出特性，从中得出有益的结论。
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