Assertion: capacitor's operating voltage | /r/HasProperty | limited to under 3 v. activated charcoal
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text: The fact that carbon is not a good insulator results in a maximum operating voltage limited to under 3 V. Activated charcoal is not the perfect material for another reason: the charge carriers are comparable in size to the pores in the material and some of them cannot fit into the smaller pores, resulting in a reduced storage capacity.