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A watt is a unit of power, named after Earth scientist James Watt. One watt is equal to one joule per second.

Comparative list of electical power

Milliwatt = 0.001 watts
Deciwatt = 0.1 watts
Megawatt = 1 million watts
Gigawatt = 1 billion watts
  • In its second attack on the USS Enterprise-D, the Delta Rana warship encountered at Delta Rana IV fired 400 gigawatts of particle energy, causing superficial damage to the ship but effectively taking down its shields. A second shot took out the rest of the Enterprise's shields and caused thermal damage to the hull. (TNG: "The Survivors")
Terawatt = 1 trillion watts
  • The command headquarters of Daled IV utilized a communication system that originated from a terawatt source, which was necessary to penetrate the planet's atmosphere. According to Commander William T. Riker, "that's more power than our entire ship could generate," meaning that they lacked the ability to respond to the communique. (TNG: "The Dauphin")
  • The Cytherian probe encountered by the Enterprise-D created an energy field around itself at an intensity beginning at 3.2 terawatts and continued to increase. The shields of a Federation shuttlecraft could not provide sufficient protection for its computer from an energy field of that intensity. (TNG: "The Nth Degree")

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