The Electric Furnace uses 384 EU per operation. When connected to a Generator, one piece of coal or charcoal, producing 4,000 EU, will provide 10.4 operations. On the other hand, an Iron Furnace uses one coal/charcoal per ten operations, and it doesn't stop and save power when there is nothing left to smelt. It can accept a maximum voltage of 32 EU/t (more than that will cause the furnace to explode). Additionally, an Electric Furnace can be powered by alternative sources such as Solar Panels. Its block ID is 250:2.
|Input||390 (3 EU/t)|
Each operation costs approximately 307 EU.
Maximum input: 32 EU/t before exploding
The four slots on the right are used to upgrade the machine. The three upgrades that are available are the Overclocker Upgrade, the Transformer Upgrade and the Energy Storage Upgrade. You can stack upgrades, but there is no use having more than 3 transformer upgrades or 13 overclocker upgrades in a furnace.
The following table shows the amount of time it takes to smelt compared to how many overclockers are in the furnace, and how much EU/t the furnace now requires with the added overclockers (note that ingame the values are rounded DOWN to the nearest tick and EU/t respectively):