Can a PC with one hand use a shield?

@nykeyoungwsCan a PC with one hand use a shield? yes

— Mike Mearls (@mikemearls) September 6, 2015

@nykeyoungwsWith a weapon? I.e. the arm is enough to hold the shield? not effectively. I'd say you can carry and use one thing per hand. Can carry more but not use

— Mike Mearls (@mikemearls) September 6, 2015