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Force sensors can be mechanical, hydraulic, or electrical strain gauges. Mechanical: These function similarly to the operation of a normal scale, where a spring moves under the application of force. The deflection of a spring is directly proportional to the applied force, so the movement is shown on a scale. Hydraulic: Often referred to as hydraulic load cells. The cell contains liquid, which becomes pressurized when a force is applied. The sensor takes the measurement by displaying the pressure on a dial. Strain gauge: This metal cylinder is compressed under application of a force. The contraction in the cylinder can be measured, as the force causes increased resistance measured by an applied electrical current. Detecting Temperature A temperature sensor converts the temperature into another quantity such as mechanical movement for a dial or an electric voltage. Thermocouple: Thomas Seebeck discovered that when any conductor gets subjected to a thermal gradient, it generates a voltage.
This prevents the sharp ends from puncturing the tape covering that is wrapped over the splice. 2) Staggering Splices Joining small multiconductor cables often presents a problem. Each conductor must be spliced and taped. If the splices are directly opposite each other, the overall size of the joint becomes large and bulky. A smoother and less bulky joint can be made by staggering the splices. Care should be taken to ensure that a short wire from one side of the cable is spliced to a long wire, from the other side of the cable. The sharp ends are then clamped firmly down on the conductor. 3) Rattail Joint A splice that is used in a junction box and for connecting branch circuits is the rattail that is installed in buildings is usually placed inside long lengths of steel or aluminum pipe called a conduit. Whenever branch or multiple circuits are needed, junction boxes are used to join the conduit. To create a rattail joint, first strip the insulation off the ends of the conductors to be joined.