Determining turns ratios for three-transformers is directly related to understanding that the number of turns primary verses secondary phase determines the turns ratio of the transformer. Can you answer the following question with ease? Question: The turns ratio of a 480v/208v/120v three-phase, 4-wire delta-wye transformer is which of the following? A. 1:2 B. 2:1 C:1:4 […]
Knowing the difference between an answer choice that could be correct verses the BPA or best possible answer choice can determine whether you pass your electrical examination. Can you identify the BPA for the following question? The type of fault in which the unintentional pathway of the straying current flows directly to earth (to ground) […]
There is no shortage of do-it-yourself electrical study guides available that promise to prepare you to pass the electrical exam. However there is a tremendous difference between do-it-yourself electrical exam study guides and the electrical exam study guidance you need to succeed. Effective electrical exam preparation helps you make the connection between the work you […]
Knowing which formula to use and how to use it is critical to effectively answering calculation related question on master and journeyman electrical exams. Which formula would you use to answer the following question: When the alternating current is given as 80 amperes, what is the maximum value of the current in a cycle? Solution: […]
To apply ohm’s law correctly when answering questions on your electrical exam, note how differently total resistance is calculated when resistances are in series verses parallel. Question: What is the total resistance of a circuit containing a 10-ohm, 20-ohm, 30 ohm and 40-ohm resistance? Each resistance is in its own paralleled branch and has an […]
Understanding the difference between connected load verses demand load when answering household cooking equipment demand load calculation questions on the Chicago Supervising electrical exam is crucial to passing your electrical exam. What is the service demand load in kilowatts for 1-12kW 240v/120v single-phase range? A. 12 kW B. 10 kW C. 8 kW D. None […]
To really understand how to calculate the power factor or efficiency of any motor you must understand the difference between true power and apparent power. True Power = power used to do useful work. Apparent Power = power with the potential to do work-but no ability to do useful work independently. Calculate True Power: Since […]
When answering Chicago Supervising electrical exam questions it is easy to automatically reach for the gauge size you’ve used for an installation hundreds of times before. Concerned that the size you normally use may be too small? Just going up a gauge size or two may not necessarily be the answer. The length of the […]
The pent-up demand for licensed electricians to work on new construction, maintenance and repair projects is high nationwide. The only way to position yourself to take advantage of opportunities that will increase your earning potential is to successfully prepare for and pass your electrical exam. Choose electrical exam prep that will prepare you to pass […]
Effective time management is always an issue when taking the electrical exam. Calculation related questions often take the greatest amount of time to answer. Knowing in advance how to quickly identify the formula required to answer these questions is key to effectively managing your time and achieving a passing score. How quickly can you answer […]
