burnt / scorched / charred / worried / anxious / coke / joule (abbr. for 焦耳[jiao1 er3])
焦
=
灬
+
隹
:
Mnemonic symbol: a magnifier, with which the sun rays can be bundled into its focus and something can be burnt.
Joan of Arc (ji) caught a sparrow (隹) in front of the aorta (ao1) and put it on a grill (灬). Using a magnifier (焦), she is trying to start the grill.