In a device specification, which setting would be described as maintaining a steady voltage rather than a steady current?

In a device specification, which setting would be described as maintaining a steady voltage rather than a steady current?

• A. Constant voltage
• B. Constant current
• C. Constant resistance
• D. Constant power

Answer: (A)

The main idea here is how a welding power source regulates its output: whether it locks the voltage or locks the current. Maintaining a steady voltage means the device is in a constant-voltage mode, where the output voltage is kept essentially fixed while the current varies as the load changes. This keeps the arc voltage stable, which helps maintain a consistent arc length and bead profile even as the welding conditions shift. In contrast, a constant-current setting would hold the current fixed and let the voltage float up or down with the load, which isn’t described here. The other options—constant resistance keeps the voltage-to-current ratio fixed, and constant power keeps the product of voltage and current fixed—don’t describe a steady output voltage. So the setting described as maintaining a steady voltage is constant voltage.

The main idea here is how a welding power source regulates its output: whether it locks the voltage or locks the current. Maintaining a steady voltage means the device is in a constant-voltage mode, where the output voltage is kept essentially fixed while the current varies as the load changes. This keeps the arc voltage stable, which helps maintain a consistent arc length and bead profile even as the welding conditions shift. In contrast, a constant-current setting would hold the current fixed and let the voltage float up or down with the load, which isn’t described here. The other options—constant resistance keeps the voltage-to-current ratio fixed, and constant power keeps the product of voltage and current fixed—don’t describe a steady output voltage. So the setting described as maintaining a steady voltage is constant voltage.