The frequency of ac is 50 hz

Two reasons: • An incandescent bulb glows not (directly) because it has electricity going through it, but because it is hot. Even when the power going through the bulb decreases, it takes some time for the filament to cool down. Even once the bulb is turned off, it takes some time (a fraction of a second) for the light to fade. • What variation there is in the light is too fast for our eyes to see. You can see the AC flicker in slow motion videos if the camera has a sufficient frame rate, for instance $\begingroup$ @user2023861 Fluorescent light bulbs have mechanisms to regulate the current going through the lamp. Thanks to these mechanisms, AFAIK there's no reason to believe any flickering is necessarily at the $100-120~\rm Hz$ that simple incandescent bulbs would be at. Older ones definitely can emit an audible hum, which may be related to headache induction. $\endgroup$ We already have great answers, but I'll add an anecdote to this: I once played around with several light sources and a scientific camera. The overall experiment was not overly scientific, and I only had one example of each light source, but it may serve as a starting point. I found that: • An incandescent bulb only has a flicker of ~5-10% of its total brightness. This is due to its thermal mass, which keeps the filament glowing. • A fluorescent tube has a variation of about 40% of its total brightness. Its plasma and fluorescent coating retain some brightness, until the next current wave hits. • A cheap ...

21.3.7 Resonance in AC circuit ⚪ is defined as the phenomenon that occurs when the frequency of the applied voltage is equal to the frequency of the RCL series circuit. ⚪ Figure 21.18 shows the variation of XC, XL, R and Z with frequency f of the RCL series circuit. Figure 21.18 51 ⚪ From Figure 21.18, the value of impedance is minimum Zmin when (21.27 ) where its value is given by This phenomenon occurs at the frequency fr known as resonant frequency. ⚪ At resonance in the RCL series circuit, the impedance is minimum Zmin thus the rms current flows in the circuit is maximum Imax and is given by (21.28 52 ) ⚪ Figure 21.19 shows the rms current I in RCL series circuit varies with frequency. ⚪ At frequencies Figure 21.19 resonant frequency fr, above or below the the rms current I is less than the rms maximum current Imax as shown in Figure 21.19. 53 ⚪ The resonant frequency, fr of the RCL series circuit is given by and (21.29 ) ⚪ The series reswohnearnece circuit is used for tuning a radio receiver. Note: At resonance, the current I and voltage V are in phase. 54 Example 21.5 : A 2 μF capacitor and a 1000 Ω resistor are placed in series with an alternating voltage source of 12 V and frequency of 50 Hz. Calculate a. the current flowing, b. the voltage across the capacitor, c. the phase angle of the circuit. Solution : a. The capacitive reactance of the inductor is given by and the impedance of the circuit is 55 Solution : a. Therefore the current flowing in the circuit is b. ...

50 Hz and 60 Hz power sources are most often used in international power systems. Some countries (regions) commonly use 50Hz power grid while other countries use 60Hz power grid. • Alternating current (AC) is changing the direction of the current periodically. • Cycle is the time of a cyclical change of the current. • Frequency is the times of the current changes per second, unit Hertz (Hz). • AC current direction changes 50 or 60 cycles per second, in accordance with 100 or 120 changes per second, then the frequency is 50 Hertz or 60 Hertz. WHAT IS HERTZ? Hertz, in short Hz, is the basic unit of frequency, to commemorate the discovery of electromagnetic waves by the German physicist Heinrich Rudolf Hertz. In 1888, German physicist Heinrich Rudolf Hertz (Feb-22, 1857 to Jan-1, 1894), the first person confirmed the existence of radio waves, and had a great contribution in Electromagnetism, so the SI unit of frequency Hertz is named for him. WHAT IS Hz USED FOR? Hz (Hertz) is the frequency unit of the vibration cycle time of electric, magnetic, acoustic and mechanical vibration, i.e. the number of times per second (cycle/sec). WHAT IS 50 HERTZ? 50 Hertz (Hz) means the rotor of the generator turns 50 cycles per second, the current changes 50 times per second back and forth, direction changes 100 times. That means the voltage changes from positive to negative, and from negative to positive voltage, this process converts 50 times/second. The electricity 380V AC and 220V AC, are...

US. Frequency is defined as the number of cycles of a repeating signal per unit of time, i.e. The number of cycles of AC signal measured per second is called Hertz (Hz). Thus, the unit of frequency measurement is Hertz (Hz). The duration of one cycle in a repeating signal is called the For example, if a sinusoidal signal in the AC system completes 50 cycles per second, then the frequency of the signal is 50 Hz and the time period is 20 milliseconds. What is a 50 Hz AC System? A power supply system is said to be a 50 Hz AC system when the waveform of the current or voltage completes 50 cycles in a second. This means that the waveform of the current or voltage changes its direction alternatively 50 times in a second. The 50 Hz AC system is very popular in India. In India, AC What is a 60 Hz AC System? 60 Hz AC system when the waveform of the current or voltage completes 60 cycles per second. In this system, the waveform of the current or voltage changes its direction alternatively 60 times in a second. The 60 Hz AC system is extensively used in the US. In the US, AC power having a sine waveform is generated and transmitted at 60 Hz. Reason of use of 50 Hz supply in India & 60 Hz in the US Now, let us discuss all the possible reasons why a 50 Hz supply power system is used in India and a 60 Hz supply power system in the US. In India, when the British were ruling in India, they chose a 50 Hz AC power system and implemented it at a large scale. On the other hand, the US impleme...

The utility frequency, (power) line frequency ( mains frequency ( During the development of commercial electric power systems in the late-19th and early-20th centuries, many different frequencies (and voltages) had been used. Large investment in equipment at one frequency made standardization a slow process. However, as of the turn of the 21st century, places that now use the 50Hz frequency tend to use 220–240 In practice, the exact frequency of the grid varies around the nominal frequency, reducing when the grid is heavily loaded, and speeding up when lightly loaded. However, most utilities will adjust generation onto the grid over the course of the day to ensure a constant number of cycles occur. Operating factors [ ] Several factors influence the choice of frequency in an AC system. In the late 19th century, designers would pick a relatively high frequency for systems featuring Lighting [ ] The first applications of commercial electric power were If an incandescent lamp is operated on a low-frequency current, the filament cools on each half-cycle of the alternating current, leading to perceptible change in brightness and flicker of the lamps; the effect is more pronounced with [ citation needed] Rotating machines [ ] universal motors are common in AC household appliances and power tools, they are small motors, less than 1kW. The Generators operated by slow-speed reciprocating engines will produce lower frequencies, for a given number of poles, than those operated by, fo...

When an alternator produces sine wave: Figure below Graph of AC voltage over time (the sine wave). In the voltage plot from an electromechanical alternator, the change from one polarity to the other is a smooth one, the voltage level changing most rapidly at the zero (“crossover”) point and most slowly at its peak. If we were to graph the trigonometric function of “sine” over a horizontal range of 0 to 360 degrees, we would find the exact same pattern as in the Table below. Trigonometric “sine” function. Angle (°) Sin (angle) Wave Angle (°) Sin (angle) Wave 0 0.0000 zero 180 0.0000 zero 15 0.2588 + 195 -0.2588 - 30 0.5000 + 210 -0.5000 - 45 0.7071 + 225 -0.7071 - 60 0.8660 + 240 -0.8660 - 75 0.9659 + 255 -0.9659 - 90 1.0000 +peak 270 -1.0000 -peak 105 0.9659 + 285 -0.9659 - 120 0.8660 + 300 -0.8660 - 135 0.7071 + 315 -0.7071 - 150 0.5000 + 330 -0.5000 - 165 0.2588 + 345 -0.2588 - 180 0.0000 zero 360 0.0000 zero The reason why an electromechanical alternator outputs sine-wave AC is due to the physics of its operation. The voltage produced by the stationary coils by the motion of the rotating magnet is proportional to the rate at which the magnetic flux is changing perpendicular to the coils (Faraday’s Law of Period vs Frequency If we were to follow the changing voltage produced by a coil in an alternator from any point on the sine wave graph to that point when the wave shape begins to repeat itself, we would have marked exactly one cycle of that wave. This is most easily sh...

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer See Answer See Answer done loading Question:Q1. Select the right answer from the following: 1. If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier? a) 50 Hz; b) 60 Hz: c) 100 Hz; d) 120 Hz. 2. Determine the peak for both half cycles of the output waveform. +16 V -16 V V-4V a) 16 V, -4V; b) 16 V, 4 V; c) -16 V, 4 V; d) -16 V, -4V. 3. The output frequency of a Q1. Select the right answer from the following: 1. If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier? a) 50 Hz; b) 60 Hz: c) 100 Hz; d) 120 Hz. 2. Determine the peak for both half cycles of the output waveform. +16 V -16 V V-4V a) 16 V, -4V; b) 16 V, 4 V; c) -16 V, 4 V; d) -16 V, -4V. 3. The output frequency of a full-wave rectifier is the input frequency a) b) equal to: c) d) onc-quarter. Previous question Next question