What is the difference between ac dc electricity

Do you observe the same thing with the headlights on your car? Explain what you observe. Warning: Do not look directly at very bright light. Figure 3. AC power as a function of time.

Since the voltage and current are in phase here, their product is non-negative and fluctuates between zero and I 0 V 0. We are most often concerned with average power rather than its fluctuations—that W light bulb in your desk lamp has an average power consumption of 60 W, for example.

As illustrated in Figure 3, the average power P ave is. Similarly, we define an average or rms current I rms and average or rms voltage V rms to be, respectively,. In general, to obtain a root mean square, the particular quantity is squared, its mean or average is found, and the square root is taken. This is useful for AC, since the average value is zero.

It is standard practice to quote I rms , V rms , and P ave rather than the peak values. The common A circuit breaker will interrupt a sustained I rms greater than 10 A. Your 1. You can think of these rms and average values as the equivalent DC values for a simple resistive circuit. We are told that V rms is V and P ave is This means that the AC voltage swings from V to — V and back 60 times every second. An equivalent DC voltage is a constant V. So the power swings from zero to W one hundred twenty times per second twice each cycle , and the power averages 60 W.

Most large power-distribution systems are AC. Moreover, the power is transmitted at much higher voltages than the V AC V in most parts of the world we use in homes and on the job. Economies of scale make it cheaper to build a few very large electric power-generation plants than to build numerous small ones.

This necessitates sending power long distances, and it is obviously important that energy losses en route be minimized. High voltages can be transmitted with much smaller power losses than low voltages, as we shall see. See Figure 4. Passive Parameters Impedance.

Types Sinusoidal, Trapezoidal, Triangular, Square. Pure and pulsating. Follow Share Cite Authors. Comments: Alternating Current vs Direct Current.

Anonymous comments 5 June 12, , am Thanks — Related Comparisons. Contribute to Diffen Edit or create new comparisons in your area of expertise.

Log in ». Terms of use Privacy policy. Safe to transfer over longer city distances and can provide more power. The frequency of alternating current is 50Hz or 60Hz depending upon the country. Can sound be converted to useful energy? Can traditional gasoline-powered cars be converted to run on hydrogen fuel cells? Which engine is better at high altitude: diesel or gasoline? What is the energy of gasoline compared to the same cost of other fuels in BTUs per dollar?

Can we calculate the efficiency of a natural photosynthesis process? Browse all questions. One looks like a straight line, the other a wave; together, they power your laptop… Elizabeth Earley Alternating current AC and direct current DC are notable for inspiring the name of an iconic metal band, but they also happen to sit right at the center of the modern world as we know it.

Here the piston has two strokes one towards upward and the other towards backward on the upward stroke, the water moves in a clockwise direction and the backward direction the water displaces in an anticlockwise direction so in this way water direction changes its direction periodically with oscillation of the piston. Every Ac Waveforms have a divider line or called the zero voltage line that divides the waveform two halves as the Ac current changes the magnitude and direction periodically so on every one complete cycle it reaches zero volts.

The total amount of time taken by a waveform to repeat itself or to repeat its one cycle is called time period. You can also say the total amount of time taken by wave form to complete its one complete cycle is called time period. The rate at which the waveform repeats itself is called frequency or you can say the the number of times the waveform repeats in one second is called frequency.

The DC current is a unidirectional flow of current or electric charge unlike AC it does not change the magnitude and polarity with time. The DC current has constant magnitude and direction and as the direction and magnitude not changes so the frequency of DC current is zero.

The electrons in DC current flow from high electron density to low electron density. We can get DC from Ac current using the process called rectification and the device that does this is called a rectifier.

C and D. Difference between points plz mention on serial ways with separate.