A 120 volt household circuit has a 360-Watt blender and a 30ohms light connected to the source in parallel: A) How much current (amps) must the source provide? B) How much power (Watts) is used in the 30ohms light?
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A 120 volt household circuit has a 360-Watt blender and a 30ohms light connected to the source in parallel:
A) How much current (amps) must the source provide?
B) How much power (Watts) is used in the 30ohms light?
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- In a particular city, electrical energy costs $0.13 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ ??? (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ ??? (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 4.30 hours? $ ???In a particular area of the country, electrical energy costs $0.18 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 3.90 hours? $The power supply to a typical black and white television set is 85 W. When the set is connected to 120v. a.) How much electric energy does this set consume in 1 hr? b.) A color television set draws about 2.5 Amperes while connected to 135V. How much time is required for it to consume the same energy as the black and white model in 3 hrs?
- What is the maximum power level of a radio station so asto avoid electrical breakdown of air at a distance of 0.65 mfrom the transmitting antenna? Assume the antenna is apoint source. Air breaks down in an electric field of about 3 x106 v/m?Which of the following statements is INCORRECT? The visible spectrum is a relatively small band of frequencies within the EM spectrum. The energy of an EM wave is proportional to the square of its amplitude. EM waves all travel at the same velocity in a vacuum. A resonant circuit can produce EM waves in all ranges of the EM spectrum. None of the above.With each beat, the human heart generates a electromagnetic field, and the potential difference (voltage) oscillates over the course of each beat cycle. So, like an antenna, the human heart generates an electromagnetic wave. An electrocardiogram (EKG) is a medical diagnostic tool that measures the voltage (difference) between electrodes that are attached to different parts of your body, producing a chart that (hopefully) looks like the rhythmic pulses shown in figure. An EKG reveals that your heart is beating 72 times a minute, and that each beat generates a maximum potential difference, Vmax = 3.5-mV, across the 0.35-m width of your chest cavity. Use &o = 8.854 x 10-12 Nm²/C², Ho = 4 x 10-7 Tm/A, and c = 2.998 x 108 m/s.
- A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.19 V/m at a point 9.05 m from the source. What is the average power output from the source? (Use c = 2.9979 x 108 m/s)Estimate the rms electric field in the sunlight that hits Mars,knowing that the Earth receives about 1350 W/m2 and thatMars is 1.52 times farther from the Sun (on average) thanis the Earth.At what distance does a 100-W lightbulb producethe same intensity of light as a 75-W lightbulb produces10 m away? (Assume both have the same efficiency forconverting electrical energy in the circuit into emittedelectromagnetic energy.)
- An important news announcement is transmitted by radio waves to people who are 100 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.0 m from the newscaster. Who receives the news first? Explain. Take the speed of sound in air to be 343 m/s.In the high-voltage circuit of the X-ray generator, a transformer is used to supply a 50000 V to machine with power from a 150 V wall plug. The x ray machine operates at 160000 W of power for the production of X- rays. (1.25+1.25+1+0.5=4 marks) (a) What is the current in the secondary coil of the transformer in ampere? (b) What is the current in the primary coil in ampere? (c) What is the ratio of the number of secondary to primary turns? (d) What type of transformer is this transformer4. A circular capacitor of radius R holds a conductive current I. as it begins charging. As the current charges the capacitor, the electric field between the plates begin to increase in strength of E(t) = at³ +c in Newtons per Coulomb. (a) State the expression for Maxwell-Ampere's law. What is the major dif- ference between the Maxwell-Ampere law and Ampere's Law? Show how we arrive to this solution. (b) Determine the magnetic field strength at t = 2 seconds and position from center of cross section of capacitor at r = (1/4)R in terms of µo and eo.