PL74-43
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29172686-PL74-43
In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.
The rate of oscillation of electromagnetic radio waves in the range of 3 kHz to 3 GHz, as well as the alternating currents carrying the radio signals.
IP (or "Ingress Protection") ratings are defined in international standard EN 6529 (British BS EN 6529:1992, European IEC 659:1989). They are?used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies?(tools, dirt etc) and moisture.