物体的电量单位是库仑。

The unit of electric quantity is coulomb.

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由于这是能量消耗的值而非电量值(我们的电量值是200w)，所以我们需要指定这个值的单位以确保它的正确性。

Because this is a measure of energy used, not power (which our 200w value is), we need to specify the units for this value to make sure everything is right.

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超级电容(单位能量比电池贵)只可以存储类似锂离子电池5%的电量。

Ultracapacitors (which are also more expensive per energy unit than batteries), can store only about 5 percent of the energy of comparable lithium-ion batteries.

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