CORRECTION OF AN ERROR: *Stop Saying Low Voltage To Mean Low Current* In countless number of times, I have read and heard people say Low Voltage when the current in an electric bulb is low or a current in a circuit is insufficient to power a device. This is too erroneous and I wish to correct it right here and now. From the science of elect/elect (electricity and electronics), voltage and current are two different concepts and one can never be used to complement or used instead of the other. Let me start by defining: • Electricity: It is the movement of electrons. These electrons carry charge for small circuits (e.g radio battery) or power for big circuits (e.g NEPA transformer). This charge/power does work - the work is what we make us of; for example, the lightening of a bulb or the playing of a radio. Thus, electricity is the movement of charge/power. • Voltage: It is the difference in the charge/power between two points. Its responsible for pushing the power across one place to another in the circuit. For example, if we say, the voltage in a finger battery is 1.5vollts. This means that 1.5volts is what is responsible for moving the power in the battery. • Current: It is the rate at which the charge/power flows in a circuit. If we say, the current in a battery is 2A (Ampere), this means the power moves from one place to another at the rate of 2A. Having gotten the fundamentals, then, let us see the relationship between voltage and current in a circuit. Ohms Law: The relationship between voltage and current is tutored using ohms law formular which states: R=V/I That is: Resistor(R) is directly proportional to Voltage(V) and inversely proportional to Current(I) And, V=IR. i.e Voltage(V) is directly proportional to Current(I) and Resistor(R). This therefore means that when the voltage increases, the current would also increase. NOTE: * The above expression, V=IR is only applicable to little circuits like electronic batteries where the current is small. In these cells, Low Voltage = Low Current and vise-versa. * But when it comes to high inputs and outputs, example; NEPA transformers, the formular and manipulation changes to P=VI That is: Power(P) is directly proportional to Voltage(V) and Current(I). And, V=P/I i.e Voltage is directly proportional to power but now inversely proportional to Current. ***The entrance of inverse proportion in the above equation means that when the Voltage is High, the Current will be Low and when the Voltage is Low, the Current will be High*** With the above jargon, I am satisfied that you now understand why it is very wrong to say the voltage is low when the current in your electric bulb is low. [How do you find this piece?]
Posted on: Sat, 04 Oct 2014 19:37:52 +0000
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