电位计

• 曰(speak; bright cloud)ASSOCIATIVE
• 乚(lightning bolt; hook stroke (downward))ASSOCIATIVE

A flash of lightning bursts bright through the clouds—that is electricity itself!

• 亻(person; people)RADICAL
• 立(stand upright; stand straight)PHONO-SEMANTIC

A person's position is determined by where they stand.

• 言(word; speech)RADICAL
• 十(ten)PHONETIC

Calculation is using words to count numbers one by one.