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Jumper wires and pre-crimped leads are a type of electrical connector used in electronic assemblies and products, which are designed to help make connections in the circuit simpler and more reliable. Jumper wires are made from small insulated electrical wires or resilient flexible wires and usually have an open end to insert a component\'s contact in. The other end contains a male or female connector which makes physical contact to another component. Pre-crimp leads, on the other hand, are more specialized and are designed to connect between two components without any soldering. They have a soldered end for insertion into a circuit board and an insulated barrel at the other end with a closed female or male connector.

Jumper wires can be used in a variety of applications, such as power applications, signal applications, and ground applications. Power applications employ the use of jumper wires to distribute power from the power supply to other components in the circuit. Signal applications employ the use of jumper wires to pass data signals from one component to another. Ground applications allow the user to ground different components on a circuit board, thus eliminating the possibility of shorts due to lack of grounding. The use of jumper wires also simplifies the process of making connections in circuits, especially in more complex circuits that require multiple coupling points.

Pre-crimped leads are commonly used in more specialized applications. They are designed to provide a reliable connection between components without the need for soldering. They are used in areas where high-voltages or currents are present, as they provide a reliable connection with much lower risk of short circuits or accidental disconnects. Pre-crimped leads are also used in applications where repeated assembly and disassembly of components is required, as they remain secure even after multiple disassembly and reassembly.

Jumper wires and pre-crimped leads work in a very simple manner. The open end of the jumper wire or the male end of the pre-crimp lead is inserted into the contact of one component. The other end is connected to the contact of the other component that needs to be connected. This connection closes the circuit between the two components, allowing them to interact with each other. The use of jumper wires and pre-crimped leads ensures a reliable connection between components with minimal risk of accidental shorts or disconnects.