当我们打开装置的开关后，这些碳纳米管就带有约为300微瓦能量的电流。
When the device is switched on the nanotubes carry an electric current with a power of about 300 microwatts.
具体地说，如果装置为低阻抗，那么通过开关的电流就会引起很明显的压降。
In particular, if the devices have low resistance, the current flowing through the switches may cause a significant voltage drop.
每一套装置应包括一个主开关和电流表，电流表的刻度范围约20安培。
Each unit should include a main switch and ammeter with a scale of about 20 ampere capacity.
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