Small versions, ranging in size from 15–40 mm (0.59–1.57 in) in length, are used in electrical laboratory work. The clip is typically covered by a plastic shroud or "boot" to prevent accidental short-circuits. When manufactured for electronics testing and evaluation, one jaw of the clip is typically permanently crimped or soldered to a wire, or is bent to form the inner tubular contact of a ~4 mm (0.16 in) female banana jack, enabling quick non-permanent connection between a circuit under test and laboratory equipment or to another electrical circuit. This enables 4-wire measurement of circuits with very low resistances. A Clothespin or Kelvin clip is a special form of crocodile clip whose jaws are insulated from each other, allowing two isolated wires to connect to a single test point. The clip's tapered, serrated jaws are forced together by a spring to grip an object. It is used to clamp and grab onto a bare electrical cable to a lead on a battery or some other electrical component. This simple mechanical device gets its name from the resemblance of its serrated jaws to the toothed jaws of a crocodile or alligator. This device is a variation of Dusinberre's original crocodile clip design Crocodile clips, also called automotive clips, on a set of jumper cables Three crocodile clips: a bare standard-sized clip a miniature clip in a yellow plastic boot a large red Square D multi-function clipĪ crocodile clip or alligator clip is a plier-like spring-tensioned metal clip with elongated, serrated jaws that is used for creating a temporary electrical connection. JSTOR ( May 2013) ( Learn how and when to remove this template message)Īlligator clip A crocodile clip manufactured by Mueller Electric.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Always connect the Earth first when jumping a car, and only then connect the hot lead.This article needs additional citations for verification. Unlike most alligator clips, these use a very strong spring to ensure they stay on the battery. Jumper CablesĪlligator clips are an important part of jumper cables, providing the connection you need to get the current flowing from one car to another. An RCD is a device that detects a current imbalance like one that a person touching a live circuit might cause, and it immediately shuts off the circuit to protect the person. The way they work is that the unit plugs directly into a mains power point and induces a current imbalance in order to determine how much of an imbalance would be necessary to trip the RCD. With designs to check residual current devices, they are an important piece of electrical safety equipment. One form of tester that does not need to use alligator clips is RCD tester other test and measurement devices. You can also use them for temporary repairs of broken circuits. All you have to do is attach the clips to any terminal you want to bridge. With a clip on each end, leads let you bridge circuits very easily. Test LeadsĪlligator clips are extremely common on test leads. While some rely on simple contact probes, many more use alligator clips because they do not come loose just as you're making the test. No matter what kind of other test measurement and inspection equipment you may be using, it all basically ends up as an electrical metre. You can bridge gaps, or connect testing equipment in a matter of moments. Getting their name from the saw-toothed edges along the jaws, they are perfect for any situation where you have to create a temporary electrical connection. Alligator clips are some of the most important but also underrated pieces of test equipment you can buy.
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