Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 13RQ
Is it less expensive to operate the electric heating unit in Question 12 on 240 V or 120V?
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Heater A and Heater B are in parallel across a 110 volt supply. If the total power of the two heaters is 2,250 watts and heater A takes one half as much power as heater B. What is the resistance of B?
a.
16.13 ohms
b.
14.08 ohms
c.
12.01 ohms
d.
8.067 ohms
What is the current in amperes in a 3-phase circuit when the load is 135 horsepower, the efficiency is 90%, the voltage is 440 volts, and the circuit power factor is 0.80? Round the answer to the nearer hundredth.
No matter how much you try to adjust the voltage knob, voltage cannot be set when attempting to reach a DC power supply of 12VDC. What are the possible solutions to this problem?
Chapter 2 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 2 - What is a coulomb?Ch. 2 - What is an ampere?Ch. 2 - Define voltage.Ch. 2 - Define ohm.Ch. 2 - Define watt.Ch. 2 - An electric heating element has a resistance of 16...Ch. 2 - How many watts of heat are being produced by the...Ch. 2 - A 240-V circuit has a current flow of 20 A. How...Ch. 2 - A 240-V circuit has a current flow of 20 A. How...Ch. 2 - A 240-V air-conditioning compressor has an...
Ch. 2 - Prob. 11RQCh. 2 - A 5-kW electric heating unit is connected to a...Ch. 2 - Is it less expensive to operate the electric...Ch. 2 - 14. Is it less expensive to operate the electric...Ch. 2 - You are an electrician on the job. The electrical...Ch. 2 - You have been sent to a new home. The homeowner...Ch. 2 - You are an electrician installing the wiring in a...Ch. 2 - A homeowner is installing a swimming pool. You...Ch. 2 - A homeowner is installing a swimming pool. You...
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- The hot water for the heating system for a small factory is supplied by a single boiler. The bolier is locatd in a small building separate form the factory. The power supplied to the bioler is 240-volt single-phase without a netural conductor. At the present time, the small building housing the bioler has no inside lighting. The business owner desires that four 100-watt lamps be installed inside the building. All lamps are to be connected to a single switch. The lamps are to be connected to the present 240-volt sercvice inside the building. How would you accomplish this task? Explain your answer.arrow_forwardFor the subtractor, if V2 equals 5 volts DC, and V1 is 4 volts DC, then the O/P is .A The answer is 4 volts DC B The answer is 9 volts DC The answer is 1 volt DC .D The answer is 5 volts DCarrow_forwardHow does the magnitude of the voltage across the power supply compare to the voltage across the bulb with the switch open? How do they compare with the switch closed?arrow_forward
- T bac 79. Which of the following formulas can be used with Ohm's law to determine the amount of voltage necessary to push ampere of current through ohms of resistance? a. E=IXR E = 0.8 AX 6 E = 4.8 V b. C. d. XL = 2 π fL 1 = XL X₁₁ = X₁₁ + X₁₂ + X₁3 80. A ceiling fan has a light kit attached to the fan. What type of load is the light kit? a. power b. capacitivearrow_forwardTwo heating units A and B are connected parallel across a 240-volt supply. Unit B takes thrre-times as much power in A, and the total power is 2400 Watts. Determine resistances of A and B.arrow_forwardFive (5) identical resistors connected in parallel across a 230 V source for a large motor. The instruction manual states that the entire circuit requires 350 watts. What should be the value of each of the resistors: A. 30 ohms B. 151 ohms C. 327 ohms D. 755 ohmsarrow_forward
- The alternator voltage is higher than the battery voltage by around 2 volts, why?arrow_forwardWhat is the current through the resistor RC, IC, in amperes? (Enter the number, not the units.)arrow_forwardPChallenge This Question What color code is used for electric utilities? ✔Bookmark Question Red Orange Yellow Blue «First Previous Question = Sarrow_forward
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