Constant voltage machine output slope is described as

Constant voltage machine output slope is described as

• A. Almost horizontal.
• B. Steep upwards.
• C. Steep downwards.
• D. Highly fluctuating.

Answer: (A)

Constant voltage operation keeps the arc voltage nearly constant as welding current changes. In practice, when current varies (due to changes in amperage or wire feed), the voltage stays within a narrow range, so the voltage–current relationship is a very flat line. That’s why the output slope is described as almost horizontal. This flat slope helps stabilize the arc because large voltage swings aren’t needed to accommodate current changes. The other options describe voltages that rise quickly, fall quickly, or fluctuate a lot with current, which is not how a constant voltage power source behaves.

Constant voltage operation keeps the arc voltage nearly constant as welding current changes. In practice, when current varies (due to changes in amperage or wire feed), the voltage stays within a narrow range, so the voltage–current relationship is a very flat line. That’s why the output slope is described as almost horizontal. This flat slope helps stabilize the arc because large voltage swings aren’t needed to accommodate current changes. The other options describe voltages that rise quickly, fall quickly, or fluctuate a lot with current, which is not how a constant voltage power source behaves.