Link to purchase the Electrical Calculations Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Panel Calculation Spreadsheet: https://hotm.art/ytd-planilha-quadro-... Link to purchase the Electrical Plant Sizing Spreadsheet: https://hotm.art/ytd-planilha-plantas... __________________________________________________ If you like the Eletricity channel and want to contribute to the generation of quality content, then access one of the options below: PIX KEY ???? [email protected] QR CODE ???? https://bit.ly/doacao-pix __________________________________________________ ???? Check out our content ???? ???? https://linktr.ee/Eletricity __________________________________________________ There is still a lot of doubt regarding the definition of proportionality between Current and electrical Voltage. This video attempts to clarify in a very didactic way this doubt that some electrical professionals still have. If we observe the mathematical concepts that support the theories, we come to the conclusion that voltage and electric current are directly proportional. Let's explain: Ohm's law shows us that V = RxI, working a little more with this formula we come to the conclusion that I = V / R. So far so good. V = Voltage R = Resistance I = Current Another widely used formula is P = VxI, working with this formula we come to the conclusion that I = P / V. P = Power V = Voltage I = Current Given the formulas above, we use two showers to try to clarify the doubts surrounding the mistaken concept that the higher the voltage, the lower the current. Case 1 - 127V - 5500W shower - Resistance 5.3 ohms. Case 2 - 220V - 5500W shower - Resistance 15.3 ohms. Note that for the 220V shower I have a resistance value 3 times greater than for the 127V shower. According to Ohm's law, the current will be lower for the 220V shower in relation to the 127V shower. But realize that the current will be lower not because the voltage is higher, but simply because the 220V shower has a much higher resistance than the 127V shower. Now imagine that the 220V shower has a resistance with the same value as the 127V shower. In this case, applying Ohm's law, it is very clear that the 220V shower would have a much higher current, which would lead to the burning of its resistance. (see the result in the video). When we apply different voltages to the same resistance, the resulting currents will also be different. If we increase the voltage, the current increases proportionally to this increase in voltage (directly proportional). What needs to be clear is that equipment with the same power value, built for 220V or 127V voltages, have resistance values ​​that were calculated for that specific power. If we measure internally, we will conclude that for the same power value, a 220V equipment has a higher resistance than a 127V equipment. Note: Remember that we are not considering Bivolt equipment that has internal electronic switching characteristics that identify the input voltage value and adjust (electronically) to a constant output voltage and power. We could only reach the conclusion that the higher the voltage, the lower the current if we assumed that the power is fixed, but we know that the power (which constitutes work W=J/S) is not fixed. All equipment is built to work with a certain power, but the value of this power is directly related to the value of the applied voltage. So if we vary this voltage, we will also be varying the value of the current and the power. Which brings us back to the direct proportionality between Voltage and Current. The conclusion is that using the term “the higher the voltage, the lower the current” as a general rule for any electrical application is false. Voltage and current should always follow Ohm's law, and by this same law, they will always be directly proportional. Note: In the case of transformers, which do not behave as a load and have a power transfer characteristic, the detailed explanation of this effect on the voltage x current relationship will be the subject of a future video. ???? Tune in to #electricity ???? __________________________________________________ Related videos: We tested the WAGO 221 and the result was incredible! ???? https://bit.ly/2PknMoz __________________________________________________ PRODUCTION AND EDITING Adoniran Freitas Afrânio Freitas Maecilei Leal Dálcio Araújo