The best frequency is a compromise among contradictory requirements. All of these factors interact and make selection of a power frequency a matter of considerable importance. Lighting, motors, transformers, generators, and transmission lines all have characteristics which depend on the power frequency. Several factors influence the choice of frequency in an AC system. This is used by some clocks to accurately maintain their time. However, most utilities will adjust the frequency of the grid over the course of the day to ensure a constant number of cycles occur. ![]() In practice, the exact frequency of the grid varies around the nominal frequency, reducing when the grid is heavily loaded, and speeding up when lightly loaded. Both frequencies coexist today (Japan uses both) with no great technical reason to prefer one over the other and no apparent desire for complete worldwide standardization. However, as of the turn of the 21st century, places that now use the 50 Hz frequency tend to use 220–240 V, and those that now use 60 Hz tend to use 100–127 V. Large investment in equipment at one frequency made standardization a slow process. Current usage by country or region is given in the list of mains electricity by country.ĭuring the development of commercial electric power systems in the late-19th and early-20th centuries, many different frequencies (and voltages) had been used. In large parts of the world this is 50 Hz, although in the Americas and parts of Asia it is typically 60 Hz. The utility frequency, (power) line frequency ( American English) or mains frequency ( British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user. What are the equivalent units for direct materials and conversion costs, respectively? A) 1,200.5 units 1,160.64 units B) 1,050 units 1,012.5 units C) 1,050 units 887.5 units D) 962 units 990 units E) 990 units and 962 units 2. The following data are related to the Assembly Department for the month of June: Physical units DM costs CC Costs Work in process, beginning inventory (50% complete) 250 units $180,000 $270,000 Units started during June 800 units $1,000,000 $1,000,000 Work in process, ending inventory (75% complete) 150 units 1. ![]() ![]() Each product must pass through the Assembly Department and the Testing Department. It utilizes two cost categories: direct materials and conversion costs. Transcribed image text: Use the following information to answer the next 5 questions) Father Time Clock Shop uses weighted average process costing.
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