Yes, ZAPPED is a Scrabble word!

Letter values in Scrabble US: Z 10, A 1, P 3, P 3, E 1, D 2.

Is it a valid word?

ZAPPED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

strike suddenly and with force
kill with or as if with a burst of gunfire or electric current or as if by shooting
strike at with firepower or bombs
cook or heat in a microwave oven

Also: micro-cook.