BECAUSE OF FRICTION, ELECTRIC DRILLS GENERATE HEAT. THE MOTOR, THE DRILL BIT, AND THE WALL ALL GET HOT. IT TAKES ABOUT 2,000 JOULES OF ENERGY TO HEAT ONE KILOGRAM OF WOOD JUST 1 DEGREE CELSIUS. ASSUMING A TYPICAL POWER DRILL USES 750 WATTS OF ELECTRICITY, AND IT PUTS OUT 750 JOULES OF ENERGY, WOODFORD CALCULATES THAT IT WOULD TAKE JUST FOUR MINUTES TO SET FIRE TO A WOODEN WALL IN A 68 DEGREE FAHRENHEIT ROOM.