A negative terminal is the grounded terminal on a car battery, typically marked by a minus (-) sign. It is usually color-coded black. The other terminal is positive, usually color-coded red or orange, and marked with a plus (+) sign. The grounded terminal connects to a grounded source on the vehicle, typically a bolt in the chassis.
also jack-boot (jÄkâ²boÍotâ²) n. 1. a. A stout military boot with a flared top that extends above the knee. b. A stout military boot that has an often studded sole, lacks laces, and extends to mid-calf.
A jack, screwjack or jackscrew is a mechanical device used as a lifting device to lift heavy loads or to apply great forces. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be performed. Jacks are usually rated for a maximum lifting capacity (for example, 1.5 tons or 3 tons). Industrial jacks can be rated for many tons of load.