Table of Contents
What is the formula for power ohms law?
Power is directly linked to Ohm’s by Joule’s law, which says that the heat produced in resistance is proportional to the square of the current flowing through it over a given time. We can express this as P=V*I and because V=I*R, we get P = I*I*R or P=I2R. In the same way P=V2/R.
How do you calculate the power absorbed by a resistor?
First, we use Ohm’s law ( V = I × R ), to find the current through the resistor. The voltage across the resistor is V = 9 V. The resistance of the resistor is R = 100?. Then, we can use the power rule ( P = I × V ), to find the power dissipated by the resistor.
How do you calculate power consumption?
To calculate power consumption of any appliance, you have to multiply it’s wattage by the number of hours it is being used (operational hours). For example, a 1000 watt electric iron running for one hour will consume (1000 watt X 1 hour) 1000 watt hour or 1 kilowatt hour (kWh) of electricity.
Is power absorbed?
The total power delivered to a circuit is equal to the total power absorbed….
| Energy is converted from electrical energy into some other form | Power is absorbed from the circuit | + |
| Energy is converted from some other form into electrical energy | Power is delivered to the circuit | – |
How do you calculate the power dissipated by a resistor in an ac circuit?
Divide the voltage by the total resistance to get the total current in a series circuit. In a series circuit, the same current flows through each resistor. Multiply the square of the current with the individual resistances to get the power dissipated by each resistor.
How do you calculate the power consumption of an electric motor?
Calculate the power the motor consumes while in operation. The equation is W = AV(sqrt 3) where A is amperes, V is volts, and sqrt 3 is the square root of 33 (about 1.73). W is the power consumption in watts. For example, if the electric motor uses 50 amps at 240 volts, the wattage is 50 x 240 x 1.73, or 20,760 watts.
How is absorbed power calculated?
Pa = (n/100)* SQRT(3) * V * I * p.f.
- Where Pa is the Motor Absorbed Power (watts)
- n is the motor efficiency (%)
- V is the applied voltage (volts)
- I is the current (amps)
- p.f is the power factor.
What is absorbed power?
Fan Input Power or Absorbed Power. This is the power consumed by the impeller – it excludes all losses due to the internal contents of the unit – fans, controls, power supplies etc. This is the power to be used in the calculation of Fan Efficiency.
What is the power dissipated in the resistor?
Any resistor in a circuit that has a voltage drop across it dissipates electrical power. This electrical power is converted into heat energy hence all resistors have a power rating. This is the maximum power that can be dissipated from the resistor without it burning out.
What is the formula of power factor in AC?
How is the power factor measured? The power factor is the cosine of the phase difference between voltage and current, and as a result, the power factor is measured using the formula Power Factor = cosɸ, where ɸ is the phase difference between the voltage and current phasor.
What is the formula for power and efficiency of compressor?
Compressor Power and Efficiency Equations. P 2 /P 1 = (V 1 /V 2) n P 2 /P 1 = (V 1 /V 2) γ The head developed by the compressor is expressed in following compressor equations. This head when multiplied by the volumetric flow of gas (Q) gives the compressor power equations.
How do you calculate power from Ohm’s law?
The formula generally given for Power is: W = V x I or W = I 2 x R or W = V 2 / R. Other basic formulae involving Power are: For the original Ohm’s Law Calculations, click here. To check the color codes of resistors, use our Resistor Color Code Table And Calculator.
What is the general compression power calculation formula?
Equation 2 : general compression power calculation formula [Perry] With : P is =Power (kW) Z = gas compressibility factor (can be defined on an Amagat diagram by calculating the reduced pressure and reduced temperature of the gas) P 1 = Pressure inlet compressor (kPa) P 2 = Pressure outlet compressor (kPa)
How do you find the pressure ratio of a compressor?
Hence compressor equations are also based on adiabatic curve with n=γ, Let subscripts 1 and 2 stand for inlet and outlet process conditions of the compressor. Then the pressure ratio of the compressor is P 2 /P 1. P 2 /P 1 = (V 1 /V 2) n