Gas Fitter Practice Test

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What is the voltage of a glow-coil?

A. 2VAC
B. 9VDC
C. 24VDC
D. 120VAC

The correct answer is: A. 2VAC

The voltage of a glow-coil is typically designed to operate at low voltage levels, and 2VAC is a common specification for these types of heating elements. Glow-coils convert electrical energy into heat through the process of resistive heating. The low voltage, such as 2VAC, is often utilized in applications where safety and reduced electrical hazards are paramount. This allows for sufficient heating capability while minimizing the risk associated with higher voltages. In contrast, the other options represent voltages that are either too high for a standard glow-coil heating element or do not align with common applications. For instance, 9VDC and 24VDC are higher than what is found in typical glow-coil designs, which are more optimized for lower AC voltages. Similarly, 120VAC represents a voltage level far above the typical operational requirements for glow-coils, which would not be suitable for direct applications in many heating tasks. Thus, 2VAC stands out as the most accurate representation of the operational voltage for a glow-coil.