What would be the minimum VA requirements for a 24 VAC transformer powering four terminal electric expansion valves each with a resistance of 150 ohms?

To determine the minimum VA (Volt-Amperes) requirements for a 24 VAC transformer powering four terminal electric expansion valves, each with a resistance of 150 ohms, it’s essential to first calculate the total current drawn by the valves.

The current through each expansion valve can be calculated using Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R). For this case:

1. The voltage across each valve is 24 VAC.
2. The resistance for each valve is 150 ohms.

Calculating the current for one valve:

I = V / R = 24 V / 150 ohms = 0.16 A (or 160 mA)

Since there are four valves, the total current drawn by all the valves will be:

Total Current = 4 * I = 4 * 0.16 A = 0.64 A

To convert this total current to VA, you simply multiply it by the voltage of the transformer:

VA = Voltage x Total Current = 24 V x 0.64 A = 15.36 VA

This value represents the minimum VA requirements for the transformer to adequately power all four valves without overloading. Using this