Correct option is B
In arc welding, a step-down transformer is used to reduce the high voltage from the mains supply to a low voltage suitable for welding. This transformation is necessary because:
· Mains supply voltage (typically 220V or 440V AC) is too high for welding.
· Welding requires high current (50A – 600A) at a low voltage (20V – 80V) for proper arc formation.
· A step-down transformer converts high-voltage, low-current input into low-voltage, high-current output, which is ideal for welding.
A welding transformer typically has adjustable current settings to control the heat and penetration of the weld.
