If the open circuit voltage is 60 volt and the short circuit current is 20 amperes. Then determine the voltage required for welding if the current required during welding is 10 amperes?
A)30 v
B)60 v
C)20 v
D)40 v

Question

Quizplus · Accepted Answer

The voltage required for welding can be determined using the internal resistance of the power source, which is calculated from the open circuit voltage (Voc) and the short circuit current (Isc). The internal resistance (R) is Voc/Isc = 60V/20A = 3 ohms. When welding with 10 amperes, the voltage drop across the internal resistance is I*R = 10A*3ohms = 30V. Therefore, the voltage required for welding is the open circuit voltage minus this voltage drop, which is 60V - 30V = 30V.

If the Open Circuit Voltage Is 60 Volt and the Short