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The DC power source for are welding has the characteristic 3V + I = 240, where V = Voltage and I = Current in amp. For maximum are power at the electrode, voltage should be set at
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- 20 V
- 40 V
- 60 V
- 80 V
Correct Option: B
Constant current characteristics:
3 V + I = 240
I = 240 – 3 V
Drooping characteristics:
P = V I = V × (240 – 3 V)
| = 0 | |
| dV |
V = 40 V
