Generalized Power Equation, Ohm's Law and Ohm's Power Loss?
Apr 7, 2020 · But if you consider a motor, maybe 80 or 90% of the power will be converted to kinetic energy. For an LED, maybe 20% of the power will be converted into light. If you consider a battery charger, maybe 95% of the power will be converted to stored energy in the battery. So power delivered to the load is not the same as power loss.
Average Power Formulas - Electrical Engineering Stack Exchange
You find the instantaneous power as a function of time, integrate over the time interval of interest, and divide by the length of that interval. For a time-varying voltage with an average value of 0 volts, the average power of the resistor will be zero. That's why we use RMS power when talking about a.c. circuits. \$\endgroup\$ –
Relationship between frequency and power - Electrical …
May 1, 2014 · In terms of power frequency, the core excitation current reduces for increasing f so turns are adjusted to yield capacity whatever core steel is chosen, typically 1.5T to 2T. Slightly less core mass in kW/kg with rising f for power transmission. In terms of eddy current losses , they increase with f for same power density slightly.
Power consumed by a CPU - Electrical Engineering Stack Exchange
Your equation is correct for the power drawn at any particular instant. But the current drawn by the CPU is not constant. The CPU is running at some frequency and changing states on a regular basis. It uses a certain amount of power for each state change.
Power's relationship to Resistance - Electrical Engineering Stack …
According to this equation, Power is inversely proportional to resistance on the left side and directly proportional to resistance on the right side. How can power be both inversely AND directly proportional to resistance? Looking for more of a conceptual answer than a mathematical one.
ohm's law and power equation - Electrical Engineering Stack …
Jul 6, 2021 · This means we have 10A (Power/voltage) with a loss of 0.1kW (Current^2*Resistance). This proves that the losses are less when the voltage is high than when the voltage is low. However, I noticed something odd. When we send the 100kW at 1 kV I calculated that the current is 100A via the power equation (100 000 / 1 000).
voltage - Is power proportional to V or V^2? - Electrical …
Jan 20, 2021 · I am confused on this. We know that P = IV and V = IR. That means P = V^2/R by substitution. I understand that by that second equation we can say "power is proportional to voltage squared"...
power - What is the name of the equation P=IV? - Electrical …
Informally, this is referred to as the "power law" or "power formula". It seems that there is a widespread practice to refer to it, incorrectly, as "Watt's law". However, note that the first term potentially conflicts with a widely used meaning of "power law" which describes any situation in which two quantities are related via any any power ...
mains - When can I use the formula P=V^2/R? - Electrical …
Jun 18, 2016 · In order to calculate power loss in the transmission lines, you need to know the power received by the load end and the voltage at the load end. Use these two to calculate the current drawn from the line. Here you use P=VI. Then use the this current value and the total resistance of the transmission line to calculate the power loss.
Power = Voltage x Current - Electrical Engineering Stack Exchange
Sep 12, 2021 · I understand the equation that Power = VxI. Due to the Joule heating effect, engineers prefer to keep V high and I low to minimize the heating losses. When I think of current, it is the number of electrons passing a given point per unit time.