Potatoes May Power The Batteries Of The Future Friday‚ June 18‚ 2010 - by Ray Willington Oh‚ batteries. Can’t live with ’em‚ can’t live without ’em. It sounds like a power ballad‚ but it’s the story of our lives around here. We’ve been dealing with lofty promises and batteries that kick the bucket far too early‚ for years now. And the fact that we’re still dealing with lead-acid batteries is sort of a baffling thing to wrap one’s mind around. But all of that just might be changing. We won’t get
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25 ohm resistor has an average power of 400 watts. Determine the maximum value of the current if it is a (a) sinusoidal‚ (b) triangular. 2. Determine the effective value Vrms of the voltage function given by v(t) = 100+25 sin 3wt + 10 sin 5wt volts. 3. What average power results in a 25 ohm resistor when it passes a current i(t) = 2+3 sin wt +2 sin2wt + 1 sin 3wt amperes. 4. Calculate Irms if i(t) = 50 + 40 sin wt amperes. 5. Calculate Irms if i(t) = 150 + 50 sin wt + 25 sin
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the first dial pointer (right hand). Rs = gear ratio = the number of revolution of the disk for one revolution of the first point CTR = current transformer ratio VTR = voltage transformer ratio Example #1: A G.E.‚ three phase‚ three wire‚ 120 volts‚ type VM-63-A‚ Form 5A‚ Class 20‚ KWh meter indicates Kh of 2.4 at its nameplate and register ratio of 166-2/3 was installed at 13.2 KV wye grounded system having a current transformer of 25:5 ratio. Determine the following; a). The internal multiplier
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Materials 5 meters of varnish insulated copper wire with diameter 0.5mm PVC pipe- 300mm length 3- 1.5 volt batteries with casing 3- jumper wires with crocodile clips Multimeter Scissors Infrared Thermometer 1 roll of insulation tape Procedure 1. Wind the wire around the PVC pipe. Fix the ends of the wires to the insulation tape. Remove about 3 cm. of insulation from the wire using the tips of the paper knife. Measure the resistance of the wire using the ohm
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Conductor Investigation Experiment LabReport Introduction This experiment is about to test how will the nichrome wire effect the ampere of the electric current. All the possible factor that will effect to the volt of the current • The Length of the wire • The Diameter of the wire • Temperature • Magnetism Aim To determine the effect of the length of the wire on the ampere of the electric current. Hypothesis Nichrome is an alloy(a metal made by combining two or more metallic elements)
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100 meters to 10 kilometers. You should see scalloping in the two-ray result‚ with an envelope that decays twice as fast (on log-log scale) as the free-space result. 2. (10) Given an RF pulse s(t) = 10−3 rect( t ) cos(2π870 · 106 t + π/6) volts .001 (2) • find S(f )‚ the Fourier transform‚ and sketch the energy density spectrum in the frequency domain • Find the complex envelope s(t) with respect to the reference cos(2π870 · 106 t). ˜ • find the energy delivered to a 50 Ω load
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BOGIN‚ JR. - The One‚ Only & Official - * HOME PAGE * ABOUT ME * DISCLAIMER * CONTACT ------------------------------------------------- Top of Form Bottom of Form Flyback driver #2: NE555 quasi-resonant 16. March 2012 This single transistor flyback driver topology was created in response to achieve higher efficiency and higher output voltages from ordinary CRT television flybacks (diode split flybacks)‚ for experiments such as x-rays or ionic lifters‚ without having to
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Name _____________________ Battery‚ resistance‚ and current – Lab 17 Go to http://phet.colorado.edu/en/simulation/battery-resistor-circuit and click on Run Now. Batteries‚ Resistance and Current “Battery-Resistor”: Check “show battery” and “show cores”‚ watch what happens‚ adjust some variables 1. Why do electrons (blue dots) move? Draw a diagram of the battery‚ label the flow of electrons. The flow of current (+) is opposite; draw this and note if toward or away from + terminal
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Planning: Risk Assessment: * I will handle the power supply carefully. * I am going to only use a maximum voltage of 2 volts. * I will be careful when handling the mains equipment. * I will make sure I have a clear space to work in and nothing on the floor around me. In this investigation‚ I will set up a simple circuit to be able to read the voltage and current when the length of wire changes‚ so I then can work out the resistance. I will be using constantan wire starting of with 1m length
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sure the switch is closed. 5.Measure and note down the temperature of the bulb with the thermometer 6.Turn on the power of the power supply 7.Measure down the P.D (v) and Current (a) and the temperature as you increase by .50 each time until 4.50 volts Diagram: Variables: Controlled Variables: Filament bulb of the same type Independent Variables: Voltage Dependant Variable: Current (that is what was measured due to the voltage change)‚ Temperature (increased as bulb got brighter) Results:
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