You and a friend are studying late at night. There are three 190 watts light bul
ID: 2227369 • Letter: Y
Question
You and a friend are studying late at night. There are three 190 watts light bulbs and a radio with an internal resistance of 73.0 ohms plugged into the living room electrical outlets. You decide to have a break and have a snack, turning on the pop-corn machine that draws 9.00 A. Part A) How much electrical power are you using? Data: Assume the electric company provide you with 110 V potential difference. Part B) All the electrical outlets are part of the same 110-V circuit which has a 10-A circuit breaker. How much current in amperes (A) is required to feed all the devices described above? This tells you if you should or should not turn on the pop-corn machine. Part C) You are so tired after studying that you leave all of these household devices turned on for 10.0 hours. Calculate the cost (in dollars) of the electric bill, if the commercial rate is $.09/kWh?Explanation / Answer
THIS WILL BE HELPFUL FOR YOU AND PL RATE ME 1ST 1. light bulbs: P = 3*200 = 600 watts radio: P = 110^2/50 = 242 watts popcorn machine: P = 110*6 = 660 watts total power = 600 + 242 + 660 = 1502 watts 2. I = P/V I = 1502/110 I = 13.65 A 3. power consumption = 1.502*13 = 19.5 kWh cost = 19.5*0.09 = $1.76
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