Most powerful conical coil

According to Official Guinness Records,

The most powerful conical coil is the Tesla Coil at the Mid-America Science Museum in Hot Springs, Arkansas, USA, which produces 1,500,000 volts of electricity.

For a complete list of 2007 records, please visit 2007 Guinness Records in United States.

Other United States records that might interest you:

• Most times for a golfer to score their age and below
• Largest Irish céilídance
• Farthest distance jumped underwater on pogo stick
• Longest time to hula hoop underwater
• Tightest frying pan roll
• Largest condiment sachet
• Fastest selling book of fiction in 24 hours
• Greatest payout for sex abuse
• First successful test of UAVs in cooperative flight
• Largest chocolate (individual)
• Largest bunny hop
• Youngest hole-in-one golfer (female)