Possible Clues:

• It may control the oven, cooking the roast
• Electrical device cooked her toast
• Electrical resistor
• Electrical rose that was used to vary resistance
• Sort heat with Instrument that controls the current in an electrical circuit
• Means of controlling resistance that rose after revolution
• Current controller sorted out those probing traitor
• Variable resistance that rose with regulation
• Electrical controller
• Short tea break for the current controller