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What is the period for an AC waveform with a frequency of 400Hz?
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At 110v what body resistance would allow the lethal level of shock current to flow?
well, it depends on the individual. IIRC, 240volt Residual Current Device (AKA ELCB) designed to protect life operate at 60mA which requires a 'simple' body resistance of 4000 ohms. However, this doesn't take account of AC resistance (includes capacitive and reactive impedance) which is dependant on frequency! So, at 110v DC (you don't mention AC or DC voltage) a body resistance of below 2000 would result in a potentially lethal current ... I wouldn't want to test it however - I've had two 240v AC shocks and, to be honest, that's enough. I've 'felt' 110v AC 60Hz and also 110v AC 400Hz - the 400Hz definatly cought my attention .....
What is the relationship between electrical frequency and magnetic field speed for an ac machine?
What is the relationship between electrical frequency and magnetic field speed for an ac machine
How can you measure ac?
you can measure ac using a cathode ray oscilloscope. it will project a sinusodial waveform, showing that the current is in the positive direction in the first half and the opposite direction in the second half
How can you find the steady state current in RLC series circuit?
-- If the excitation source is AC, then the steady state of the circuit depends on the voltage, frequency, and waveform (harmonic content) of the source. -- If the excitation source is DC, then the steady state current in a series circuit is zero. DC doesn't pass through a capacitor.
What is the difference between Variable Speed Drive and Variable Frequency Drive?
A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFD's vary the speed of an AC motor by varying the frequency to the motor. VSD's referring to DC motors vary the speed by varying the voltage to the motor.
What is a cycloconverter?
A cycloconverter or a cycloinverter converts an AC waveform, such as the mains supply, to another AC waveform of a lower frequency, synthesizing the output waveform from segments of the AC supply without an intermediate direct-current link.
Rate in which ac voltage waveform periodically repeats itself?
Frequency.
What is ac waveform?
AC waveform is a graph that tells the degree and radiant. On the graph the degrees is graphed in top and the radiant is on bottom.
Why do you obtain more dc voltage than ac voltage in power supply design by using transformer?
You don't. Transformers only work with AC voltage. Their input will be an AC waveform, and their output will be an AC waveform. Other electronics are used to convert the stepped down AC waveform from the transformer to DC.
Why pf maintaining for ac only not in DC?
Power Factor measures the phase shift between current and voltage waveform. Since DC has no frequency there can be no phase shift.
Is there any possibilty of ac and DC flows in conductor at a time and get DC and AC with two reference AC and DC?
A typical AC waveform is symmetrical about a zero crossing point. You can bias the AC with DC such that the AC waveform is symmetrical about the DC voltage.
-if the period of one cycle of an AC signal is 20mS what is its frequency?
50 cycles
The period of an ac wave is?
period is the time duration of one cycle of the waveform, and is measured in seconds/cycle. AC power at 50 Hz will have a period of 1/50 = 0.02 seconds/cycle. A 60 Hz power system has a period of 1/60 = 0.016667 seconds/cycle
What are the main differences between AC and DC currents?
An AC waveform is a sine wave and varies from positive to negative with a frequency of 60 Hertz (Cycles per Second). DC is a constant voltage and does not vary like the sine wave.
How often the AC waveform repeats is known as the AC?
after every 6 units of time.
What is a 400 hertz generator mean?
It's a generator that creates 400hz AC signals, instead of 50 or 60hz. 400hz is often used on ships, because the equipment (generators, transformers) can be made much smaller.
If AC means alternating current used to light up a bulb and alternating current moves up and down then why does light emitted from that bulb not alter to give us first a low light then a bright light?
Electric light bulbs use electric current to heat a filament to high temperature which produces electromagnetic radiation which appears to us as as "heat" in the invisible part of the frequency spectrum and "light" in the visible part. The alternating current (AC) voltage waveform changes at a frequency of 50 or 60Hz (cycles per second of a sine wave) depending on which country you live in. The filament stays heated from cycle to cycle of the AC voltage waveform - the highs and lows of the AC waveform are so close that the filament does not have time to cool off much. It thus seems to emit light continuously for us and we don't notice any reduction in light. One reason contributing to this is the persistence in vision of the human eye - we see anything happening at frame rate of 20 or more per second as continuous. If it were at a slower frequency of AC we would notice the changes in light intensity which occur at the different levels of voltage in the ac waveform.
