What is an electric perculator?

It's spelled "percolator", and it was the standard, everyday, "everyone-had-one" coffee maker until the drip coffee machine ("Mr. Coffee") came in about 1970. The drip machines blew the percolator into history's dust bin. However, the big coffee "urns" you still see at church breakfasts, large buffet luncheons, etc, are percolators.