Explain how a welding transformer works.
What will be an ideal response?
A welding transformer uses the alternating current (AC) supplied to the welding shop at a high voltage to produce the low-voltage welding power. As electrons flow through a wire they produce a magnetic field around the wire. If the wire is wound into a coil the weak magnetic field of each wire is concentrated to produce a much stronger central magnetic force. Because the current being used is alternating or reversing each 1/120 of a second, the magnetic field is constantly being built and allowed to collapse. By placing a second or secondary winding of wire in the magnetic field produced by the first or primary winding, a current will be induced in the secondary winding. The placing of an iron core in the center of these coils will increase the concentration of the magnetic field.
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A. ?strontium-90 B. ?cesium-137 C. ?electron beam accelerators D. ?burnt uranium slugs from fission reactor waste
High resistance in an electrical circuit can cause ________.
A) Dim lights B) Clicking of relays or solenoids C) Slow motor operation D) All of the above
Al pegar cubiertas de codo hechas con material en láminas, ¿qué debe hacerse primero?
a. Avisarle al capataz b. Revisar la humedad c. Pegar la junta trasera d. Pegar la junta recta
What is brackish water?
What will be an ideal response?