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Electricity
Electricity
There are two types of electrical currents: Alternating Current (AC) and Direct Current (DC).
Alternating current is an electric current in which the direction of the electric current reverses at regular intervals. Despite the electric current flowing back and forth many times a second, the energy still flows continuously from the power plant to electronic devices.
In direct current, the electric current flows in only one direction from an area of high electron density to an area of low electron density. In this arrangement, there is always a positive source of voltage and a ground (0V) source of voltage. For instance, a brand new 9V battery would have a voltage of 9V and a current of around 500mA (500 milliamps).
Circuits
Circuits
A circuit is a complete and closed path through which electric current can flow. In other words, a closed-circuit allows the flow of electricity from one point to another. An open circuit would break the flow of electricity between the two points.
A circuit may include various electrical components, such as transistors, resistors, and capacitors. A flashlight is an example of a basic circuit.
Types of signals
Types of signals
There are two types of electrical signals - alternating current (AC) and direct current (DC).
With alternating current, the direction electricity flows throughout the circuit is continuously reversing. You may even say that it is alternating direction.
With Direct Current, electricity flows in one direction between power and ground. In this arrangement, there is always a positive source of voltage and ground (0V) source of voltage.
Current, Voltage and Resistance
Current, Voltage and Resistance
Current: Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms.
Voltage: The voltage/potential difference between two point is equal to the work done per unit of charge against a static electric field to move the charge between two points.
Resistance: The tendency of a material to oppose the flow of electrons.
DID YOU KNOW
Electricity travels at the speed of light -- more than 186,000 miles per second!
DC voltage is a simple positive and negative type of electricity; power storage is usually in DC. With the future being mobile and compact, we can actually see DC becoming the voltage of choice
If the voltage is sufficient enough, electric current can pass through air. Lightning strikes, when the voltage builds enough to pass through air.
Assessment
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