A description of alternating current
As a result, Edison proposed a system of small, local power plants that would power individual neighborhoods or city sections. This experiment was amid to create signals for AC voltage using function generator, measuring the signals using oscilloscope, determining the RMS value of AC signals, analyze the effect of frequency, offset and peak voltage on its value.
A description of alternating current
The graph which represents the manner in which an alternating current changes with respect to time is known as wave shape or waveform. Describing DC DC is defined as the "unidirectional" flow of current; current only flows in one direction. Introduction In AC, the movement of electric charge periodically reverses direction and it forms in which electric power is delivered to businesses and residences. If the load on a three-phase system is balanced equally among the phases, no current flows through the neutral point. AC vs. VP is the amplitude. To obtain effective voltage from peak voltage, multiply by 0. We can plug these numbers into our formula to get the equation remember that we are assuming our phase is 0 : We can use our handy graphing calculator to graph this equation. The alternating current is generated in the power station because of the following reasons. Notice that the pinched section of pipe still provides resistance to the flow of water regardless of the direction of flow.
An example of sine-wave AC is common household utility current in the ideal case. This arrangement is sometimes incorrectly referred to as "two phase".
How to create ac current
Phase is a measure of how shifted the waveform is with respect to time. This allows the voltage to be stepped up increased for transmission and distribution. For example, if an AC power source has an effective voltage of V, typical of a household in the United States, the peak voltage is V. The equation to the right of the equals sign describes how the voltage changes over time. Notice that, as we predicted, the voltage rise up to V and down to V periodically. The radio-frequency RF current in antennas and transmission lines is another example of AC. To obtain effective voltage from peak voltage, multiply by 0. Because waveguides do not have an inner conductor to carry a return current, waveguides cannot deliver energy by means of an electric current , but rather by means of a guided electromagnetic field. The power transmitted is equal to the current times the voltage; however, the power lost is equal to the resistance times the square of the current. While direct current DC electricity is flowing in one direction through a wire, the direction of the AC is moving in a back-and-forth motion. In a power plant , energy is generated at a convenient voltage for the design of a generator , and then stepped up to a high voltage for transmission.
The effective voltage for a sine wave is not the same as the peak voltage. Waveguides have dimensions comparable to the wavelength of the alternating current to be transmitted, so they are only feasible at microwave frequencies.
The most common type of AC is the sine wave. Waveguides can have any arbitrary cross section, but rectangular cross sections are the most common. In the late s, a variety of inventions across the United States and Europe led to a full-scale battle between alternating current and direct current distribution.
Alternating current physics
Depending on the frequency, different techniques are used to minimize the loss due to radiation. This is given in the form of hertz or units per second. When the resistive load R is connected across the alternating source shown in the figure below, the current flows through it. Introduction In AC, the movement of electric charge periodically reverses direction and it forms in which electric power is delivered to businesses and residences. The advantage is that lower rotational speeds can be used to generate the same frequency. The most common type of AC is the sine wave. Generating AC AC can be produced using a device called an alternator.
Effects at high frequencies[ edit ] Play media A Tesla coil producing high-frequency current that is harmless to humans, but lights a fluorescent lamp when brought near it A direct current flows uniformly throughout the cross-section of a uniform wire.
However, this was not an overnight decision.
based on 62 review