51.   The main one is the Elektron system, which uses electricity to separate waste water into its constituent parts, oxygen and hydrogen.

52.   The newer ones have switched to light-emitting diodes, or LEDs, which yield better-quality video, use less electricity and last longer.

53.   The tiny engines, which make orbital corrections, use electricity to create jets of plasma, making them lighter than chemical rockets.

54.   The steam is then used for heating, while the electricity can be used for cooling.

55.   The system uses considerable electricity to remove heat from the air, and the cooled air traveling through the ducts is a resource for which you have paid dearly.

56.   They cleared their land at Muddy Pond with horses and crosscut saws, and for years refused to drive or use electricity.

57.   They came to see how electricity can be used to give combat vehicles Star Trek-like shields, as well as power their guns and super-quiet engines.

58.   They use no electricity, so they are economical.

59.   This happens when the shortcut occurs inside a motor that uses electricity to make something happen mechanically, such as fuel injectors controlled by an engine computer.

60.   This is the opposite function of a pacemaker, which uses electricity to speed up and regulate slow, irregular heartbeats.