Basic power math · Texas pack
Power and voltage drop
The rest of the calculations portion is ordinary power math: current from watts, three-phase power, voltage drop from a printed resistance, and transformer full-load current.
- Single-phase power in these explanations is P = E × I. Three-phase items use the √3 form. If the stem says three-phase, do not divide watts by voltage alone and call it done.
- Voltage-drop items print the current and the ohms, or the length and the ohms per length. You are checking whether you can run the arithmetic the stem set up. You are not looking up a conductor property the problem already gave you.
- Transformer items print the kilovolt-amperes and the voltage. Full-load current follows from those two and the phase count in the stem. Confirm any testing-vendor formula sheet you are allowed to use, and use that sheet on test day.
Current, three-phase power, voltage drop, and transformer full-load current.
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