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。
This is useful for detecting when a signal gets stuck at a particular voltage.
这是非常有用的对于检测一信号什么时候滞留在一特定电压。
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。
The voltage vector diagram is a very useful method that can make a qualitative analysis of the steady values of power system in normal and fault conditions.
定性地分析电力系统正常运行状态和故障后的稳态量时，电压相量图法是十分有用的工具。
For these applications, designers focus on circuits able to convert even the smallest available voltage levels to useful power.
对于这些应用，设计人员集中于电路能够连转换最小可用电压电平到有用功率。
However, to be useful, they must be characterized for capacitance value, voltage rating, temperature coefficient, and leakage resistance.
然而，要使用电容器就必须明白其特性：包括电容值、额定电压值、温度系数以及泄漏电阻等。
Experimental results show that such construction transformer is particularly useful for the design of low-profile and high-voltage converter modules.
实验结果表明，这种结构的变压器适用于小型化设计和高压应用。
After analysing the human body's resistance in detail, the secure current values were put forward, and the useful basis for secure voltage under various conditions was provided.
较详尽地分析了在不同状态下的人体电阻值，为各种条件下的安全电压值提供了依据。
It's useful to analyze the effect and damage to the large motor insulation by the VCB switching over-voltage based on the circuit-field analysis method.
利用场路综合分析的方法，来分析真空断路器产生的操作过电压对电动机的绝缘造成的影响和危害，具有一定的现实意义。
Because of the stability of LED current, these designs provide an expanded input-ac-voltage range, which may be useful for a multistandard ac-powered gadget;
由于LED电流的稳定性，这些设计使输入交流电压的范围扩大，其有利于多标准交流供电设计；
In the future, their PROPS probe should be useful in determining the role of membrane potential, or voltage, in a variety of medically, environmentally and industrially important bacteria.
将来，这种PROPS探针可在医学、环境和工业中检测多种重要细菌的膜电位或电压。
In the future, their PROPS probe should be useful in determining the role of membrane potential, or voltage, in a variety of medically, environmentally and industrially important bacteria.
将来，这种PROPS探针可在医学、环境和工业中检测多种重要细菌的膜电位或电压。
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