You don't have to go back to 200 BC for the story to be hard to imagine. Something around 1700 would work too. In 1800 they could already understand the "electricity" part at least.

Though the ancients did recognize as occult forces magnetism (Thales, according to Aristotle, gave the motive power of magnets as an example that even apparently inanimate objects have souls) and electricity (from triboelectic effects with amber, whence comes the name, and which Thales discussed as induced magnetism, also Plato mentions the stunning caused by electric rays), though it would be a while before the connection was made between these phenomena.