can I use my Electrum address or no?
R. Does Electrum Support Ethereum?
No, Electrum only supports Bitcoin, and they have not announced an intention to support any other altcoins at this time.
Apparently not?
Actually, you already answered your question Electrum doesn't support any altcoin it is only for BTC.
Are you looking for a wallet that supports both BTC and ETH? You can check Mycelium wallet or Coinomi wallet they support both BTC and ETH.
R. I have about $100+ in my Electrum account and I would prefer to use that to help pay for a $533.00 purchase.