Tech Docs
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Relays and contactors are electrically controlled switches. A small control signal energizes a coil, and the resulting magnetic field changes the position of one or more contacts. This lets a control circuit switch another electrical circuit without requiring a person to operate the contacts by hand. For a technician, the essential idea is simple: coil…
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Single-phase and three-phase describe two common ways alternating-current (AC) electrical power is delivered. A technician does not need advanced power-system math to recognize the basic difference: single-phase power uses one repeating AC waveform, while three-phase power uses three AC waveforms separated by 120 electrical degrees. This lesson follows OSETC.012 on grounding and bonding and OSETC.013…
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The Windows getmac command displays the MAC addresses associated with network adapters on a computer. A MAC address is a hardware-level identifier used by network interfaces, and technicians often need it when troubleshooting switches, DHCP reservations, device inventory, or adapter identity. Basic Syntax Running the command without options lists the physical addresses detected for local…
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