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It 241 Week 2 Checkpoint

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Submitted By jharlow75
Words 392
Pages 2
In Your Own Words

Jeremy Harlow

IT 241

Allyson Heisey

The Analogy of Voltage, Current, and Resistance

There are three primary characteristics that describe the nature of electrical flows. The first characteristic is voltage, which refers to the amount of electric potential the electrons have in a circuit. It is sometimes called e.g. or electromotive potential, the amount of force exerted on the electrons. For example, a battery is a source of DC voltage. If an analogy is drawn toward a waterfall, the voltage would represent the height of the waterfall from which the water is falling. More is the height of the waterfall, more is the potential of the water at the top of the waterfall, and more is the kinetic energy that reaches the bottom.

The second primary characteristic of electricity is current, which is measured in amperes. Current refers to the electrical charge from electrons through the flow of holes that leads to current. As in the waterfall analogy, the rate at which the water is falling is similar to the current flow in a circuit.

The third important characteristic of electricity is resistance, which refers to the amount of opposition to the flow of electrons. Higher is the value of resistance in electrons flowing. According to OHMS, these three characteristics are related by the equation V=I* R

[pic] Analogy of the OHMS law with the water flow model.

Analogy vs. Digital Modulation

The main aim of analog modulation is to transfer and analog low pass signals. For example, audio signal or television signals over an analog band pass channel, a limited radio frequency band or a cable television network channel.

The main aim of digital modulation is to transfer a digital bit stream over an analog band pass channel. For example, over the public switched telephone network (where a filter limits the frequency range between 300 and 3400Hz) or a limited radio frequency band. In analog modulation, the modulation is applied continuously in response to the analog information signal. In digital modulation, an analog carrier signal is modulated by a digital bit stream. Analog modulation can be of two main types: amplitude modulation and angle modulation, which includes frequency and phase modulation.

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Rate of water flow comparable to current

Resistance to water flow comparable to resistance (R)

Height of water flow comparable to voltage (V)

241

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