gira giersiepen electrical components Germany gira giersiepen models gira giersiepen prices

gira giersiepen electrical components are current-limiting elements. When a resistor is connected in a circuit, its resistance is fixed, typically with two pins, and it limits the current flowing through the branch to which it is connected. Resistors with unchangeable resistance are called fixed resistors. Those with variable resistance are called potentiometers or variable resistors. An ideal resistor is linear, meaning the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division have one or two movable metal contacts pressed tightly against the exposed resistive body. The contact position determines the resistance between either end of the resistive body and the contact. A two-terminal device in which terminal voltage and current have a definite functional relationship, reflecting the ability to convert electrical energy into other forms, is represented by the letter R, with the unit ohm Ω. Actual devices such as light bulbs, heating wires, and resistors can all be represented as resistor components. The resistance value of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical quantity measuring the extent to which resistance is affected by temperature is the temperature coefficient, defined as the percentage change in resistance when the temperature rises by 1 ℃. The main physical characteristic of a resistor is converting electrical energy into thermal energy; it can also be described as a dissipative element, generating internal energy as current passes through it. Resistors typically serve to divide voltage and current in circuits. For signals, both AC and DC signals can pass through resistors.

gira giersiepen electrical component classification

Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and more. They are all composed of single-strand or multi-strand conductors and insulation layers, used to connect circuits, electrical appliances, etc. Cables can be divided into DC cables and AC cables according to the photovoltaic power station system, and are classified into DC cables and AC cables based on usage and operating environment.

gira giersiepen electrical component principles

The working principle of a discharge tube is gas gap discharge i. When a certain voltage is applied between the two poles of the discharge tube, a non-uniform electric field is generated between the poles: under the action of this electric field, the gas inside the tube begins to ionize. When the external voltage increases to the point where the field strength between the poles exceeds the insulation strength of the gas, the gap between the two poles breaks down and discharges, transforming from an insulating state to a conductive state. After conduction, the voltage between the two poles of the discharge tube is maintained at the residual voltage level determined by the discharge arc channel. This residual voltage is generally very low, thereby protecting electronic equipment connected in parallel with the discharge tube from overvoltage damage.

gira giersiepen electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for the relay to operate normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the supplied current must be slightly greater than the pull-in current so that the relay operates stably. The operating voltage applied to the coil should generally not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pull-in state of the relay decreases to a certain level, the relay returns to the de-energized release state. At this time, the current is much smaller than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current that the relay is allowed to carry. These values determine the magnitude of voltage and current the relay can control. Do not exceed these values during use, as doing so can easily damage the relay contacts.

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