Difference Between AC and DC Current:
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The letters DC stand for direct current and its generally means the electrons flow in a single direction and the word AC stands for alternating current and it means that the flow of electrons change. Now this is where things can start to get a little confusing this is an AC voltage source, so it's both AC and voltage
How an voltage and current be the same?
Well it turns out that we use the abbreviations AC and DC for voltage as well as current. So in other words, ac voltage or current is voltage or current that changes DC voltage or current is voltage or current, that is steady.So let's take a little bit closer look at these two, starting with DC check out this double-A or lr6 battery, it provides 1.5 volts. This example circuit is going to be a DC motor like you might find in a toy car. When we insert the battery into the circuit, current begins to flow in a single direction, turning the motor.If we drew a graph where the vertical axis is voltage and the horizontal axis is time we can see that the voltage at this point stays constant now since this is a battery eventually, it's going to run out of energy and its output voltage will drop. So we know that the voltage will change with time but the polarity will remain the same.
So what is polarity?
Well polarity defines the positive direction and for a battery, the positive voltage is created from the positive terminal. So what would happen if we turn this battery around?Well that reverses the polarity, which means the current will flow in the opposite direction as before causing our motor to spin in the opposite direction. So let's move on to AC and in this case we're going to use a light bulb and AC socket. Note how the circuit behaves when we turn the switch on, let's break down what we're seeing by using the voltage graph again. Notice how the current is flowing in one direction and as voltage increases the light bulb gets brighter. Once the Voltage reaches, its peak current flow stays the same, but the voltage begins to drop and the light bulb gets dimmer. Once we reach zero volts, the voltage is polarity changes, causing current to flow in the opposite direction and again as the voltage gets closer to its peak, the ball gets brighter and then dims back down.
We needed to find a couple of things.
First is the change from start to finish is called a cycle, the rate at which the cycle repeats is frequency.Now frequency is measured by Hertz unit which means cycles per second. Different parts of the world use different frequencies for their AC systems and it can be 50 or 60 Hertz. What this means is in one second, the cycle repeats itself at least 50 times believe It or not, An Incandescent bulbs are actually flashing over 50 times per second now it turns out that this rate Is so fast that are slow. The term "current" is included in the abbreviations for "AC" and "DC," while human eyes perceive it as constant light.They can be used to describe a variety of voltage and current DC voltages do not fluctuate while DC current flows in One Direction. AC voltages change over time and the current flow can alternate direction.
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