Calculation force and power consumption formula
90kw motor is usually angle connected, working current refers to the current of each phase, 380V is line voltage, and its phase voltage is 220V. Power consumption per hour q = voltage x current x time X3 = 220 x 130 x 1 x 3 = 85800 (W.H), that is 85.8 degrees
according to the nominal power, the power consumption q = power X time x power factor, regardless of the power factor, is about 90x1 = 90 (degrees)
calculation formula of electric quantity: q = I * t, I = q / T
Q: electric quantity, unit Coulomb (c)
I: current, unit ampere (a)
t: time, unit second (s)
microscopic expression of current intensity: I = nqsv, q = I / NSV, where I is the current intensity, n is the number of charges per unit volume, s is the cross-sectional proct of conctor, and V is the velocity of charge movement
Electrical calculation:I. resistance R
1. Resistance equals resistivity times (length divided by cross-sectional area) r= ρ× L/S
Resistance is equal to voltage divided by current R = u / I The resistance is equal to the square of voltage divided by the electric power r = u & # 178/ P Electric work is equal to current times voltage times time w = uit (common formula) electric work is equal to electric power times time w = Pt Electric work is equal to charge multiplied by voltage w = UQ Electrical work is equal to the square of current times resistance times time w = I & # 178;; RT (pure resistance circuit) Electrical work is equal to the square of voltage divided by the resistance and then multiplied by the time w = u & # 178/ R × T (ditto) Electric power is equal to voltage times current p = UI Electric power is equal to the square of current multiplied by resistance P = I & # 178; R (pure resistance circuit) Electric power is equal to the square of voltage divided by resistance P = u & # 178/ R (ditto) Electric power is equal to electric power divided by time p = w / t 5. Electric power P = UInote: when the same resistance is in the same circuit, the power will become a quarter of the previous
Electric heating is equal to the square of current multiplied by resistance multiplied by time: q = I & # 178; RT (pure resistance circuit) Electric heating is equal to the current multiplied by voltage multiplied by time: q = uit = w (common formula),3. Electric heating is equal to the square of voltage divided by resistance multiplied by time: q = (U & # 178/ R) In general, electric heating is equal to the consumption of electric energy, and the premise is that the pure resistance is used in the electricity
source of reference: network power
No matter what electrical appliances are, the power will be marked in the instruction manual or on the nameplate. Generally, what we call the power consumption is kilowatt hour. According to the standard, one degree of electricity is kilowatt hour. The concept is the power consumed in an hour by an electrical appliance with a power of 1000 Watts
The conversion method of power consumption and power is as follows:
0.48/24 = 0.02, 0.02kwh = 20W * 1H, which is equivalent to the energy used by a refrigerator with 20W power running continuously for one hour, but the refrigerator works intermittently, which may only work for 15 minutes per hour, 20W * 4 = 80W, 80W * (1 / 4) hour = 20wh = 0.02kwh, 24 hour power consumption = 0.02 * 24 = 0.48kwh
so if you only work for 10 minutes per hour, it is: 20W * 6 = 120W, 120W * (1 / 6) * 24 / 1000 = 0.48kwh
the household refrigerator is 200W, and the electric energy used for 10 hours is calculated as 0.2KW x 10h = 2 kwh. Electricity consumption is measured by watt hour meter, in kilowatts per hour. The unit of power is watt. For convenience of calculation, kilowatt is used. The calculation of power consumption is simply the electric energy consumed by a kilowatt electrical equipment for one hour
therefore, only 0.48kwh/24 can not calculate the power of the refrigerator. In fact, the specific power can refer to the description label of the refrigerator
The calculation formula of electric quantity is as follows:
extended data:
reactive electric quantity and active electric quantity:
active electric quantity is the electric energy converted from other energy sources, which can actually do work, but reactive power is not. However, the active power is not generated alone, and the generator always generates reactive power when it generates active power
although reactive power can not do work, it plays a very important role in the stability of the system voltage, so it has been paid attention to. Some equipment in the power grid, such as the condenser, is specially used to generate reactive power to stabilize the grid voltage, so now the electricity charge includes the electricity charge of active power and reactive power
unit:
kW · or kWh (symbol: kW · h; Usually referred to as degree) is a unit of energy measurement, which represents the energy consumed by an electrical appliance with a power of one kilowatt after one hour of use
for example:
if the power of an electrical appliance is 800W, its hourly power consumption is calculated as follows:
800W = 0.8kw
0.8 * 1 = 0.8 (kW · h)
in other words, the electrical appliance consumes 0.8kwh, that is, 0.8kwh.
W = P * t (where W is the power consumption, P is the rated power, t is the working time, and the rated power is indicated on the equipment nameplate).
W = uit (where W is the power consumption, u is the rated voltage, I is the rated current, t is the working time, suitable for any circuit)
W = P * t (where W is the power consumption, P is the rated power, t is the working time, and the rated power is indicated on the equipment nameplate)
electric energy can be transformed into many other forms of energy. The process of transforming electric energy into various other forms of energy can also be said to be the process of electric current doing work. How much electric energy has been transformed means how much work has been done by electric current, that is, how much electric work is
the amount of work done by the current is related to the size of the current, the level of the voltage and the length of the power on time. The higher the voltage, the greater the current and the longer the power on time, the more work the current does. The research shows that when the voltage at both ends of the circuit is u, the current in the circuit is I, and the power on time is t, the electric work w (or consumed electric energy) is: w = uit
extended data:
electric work of several common objects
1. The work per second of the current passing through the flashlight bulb is about 1J
2. The work done by the current passing through the ordinary light bulb is usually tens of joules per second
3. The work done per second by the current of the motor in the washing machine is about 200 J
source of reference: network electric power