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Load is capacity times voltage. Capacity is given as ##20\,\mu F## which is (see previous post) equal to ##20\cdot 10^{-6}\cdot A\cdot s \cdot V^{-1}\,.## Voltage is given as ##24\,V## so the Volt cancel in the product and we are left with ##Q=20\cdot \mu \cdot F \cdot 24 \cdot V = 480\cdot \mu \cdot F\cdot V= 480 \cdot \mu \cdot A \cdot s \cdot V^{-1} \cdot V = 480\cdot 10^{-6} \cdot A \cdot s##