Certified Technology Specialist (CTS) Practice Exam

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If a dimmer rack is running on a steady 230 VAC and drops to 211 VAC, what is the expected amperage draw?

  1. 85 amps

  2. 90 amps

  3. 95 amps

  4. 98 amps

The correct answer is: 90 amps

To understand the expected amperage draw when a dimmer rack's voltage drops, it's important to apply Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R), or V = I * R. If the total wattage of the dimmer rack remains constant, a drop in voltage will typically result in an increase in the amperage draw, provided the load does not change. In this scenario, if the dimmer rack is designed to operate at 230 VAC and is fully loaded, the current draw at this voltage will be at a certain level, which we can denote as "I". When the voltage drops to 211 VAC, the product of voltage and current, or wattage, must remain the same. Since wattage (W) = V * I, when voltage decreases, current must increase for wattage to remain constant. To calculate the new current draw at 211 VAC, the formula would be adjusted to express the new current in terms of wattage: 1. Calculate the wattage at 230 VAC. 2. Recognize that this will remain constant when the voltage changes. 3. Substitute the dropped voltage into the wattage formula to solve for the new current. Using

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