2.17 Know that electric current in solid metallic conductors is a flow of negatively charged electrons

An electric current in solid, metallic conductors (meaning metals) is a flow of electrons, which are negatively charged.

• Current flows from positive (+) to negative (-)
• Electrons flow from negative (-) to positive (+)

(if you think that's silly, it is. But you need to know that, even if it's basically the same thing. You must know the difference. This silly thing is what happens when science changes over time...)