G2 Gas Fitter Practice Exam

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What does the "VA" rating on a transformer represent?

Voltage output
Resistance value
The available power to the secondary unit
Input current

The correct answer is: The available power to the secondary unit

The "VA" rating on a transformer stands for "volt-amperes" and is a measure of apparent power, which indicates the total power available to the secondary unit of the transformer. This rating quantifies how much load a transformer can handle safely and effectively without overheating. In practical terms, it represents the combined effect of voltage and current delivered by the transformer to its load. When evaluating transformer performance, it is essential to understand that this rating serves as a guideline for ensuring that the connected load does not exceed the transformer's capability. For instance, if a transformer has a rating of 500 VA, it can support loads that require up to 500 volt-amperes of power. The focus on the secondary unit is significant because it directly relates to what can be supplied to the devices or circuits powered by the transformer. This ensures that the devices operate at optimal levels without risk of overheating or failure that can arise from exceeding the VA rating.