亨
=
亠
+
口
+
了
:
Mnemonic symbol: American scientist Joseph Henry.
Before Henry (亨) invented inductance he used to hang out with Hamlet (h) a lot in front of the engine ((e)ng1). One day he observed Hamlet shifting a mandarin (口) from a price cup (了) to a beret (亠) and vice versa, which gave him the idea of putting an iron core into an electromagnet.
Li Qingzhao (li) prepares to go back to earth in the Arianne rocket (利). In the space station's bathroom (Ø4) she prepares for the trip by stuffing lots of cereals (禾) into the rocket and sharpening (利) the tip of the rocket with a kitchen knife (刂).