w=p×t×η can be obtained as p=w÷t÷η This formula is used to calculate the power here.
We first find w=cm(t2-t1)=4.2×10×1000×(50-20)=1260000J. The specific heat capacity of water is 4.2 × 10 J/(kg℃), and the mass of water = density times volume = 1.0X10^3 kg/m^3×10 m?
p=1260000÷ 1200÷0.8 =1.3125kW.
As a physical quantity that represents the speed of current doing work, the power of an electrical device is numerically equal to the electrical energy it consumes in 1 second. If electrical energy “W” (SI unit is J) is consumed over a period as long as “t” (SI unit is s), then the electrical power of this electrical appliance is P = W/t (definition formula). The electrical power is equal at both ends of the conductor. The product of voltage and current flowing through a conductor. ?
(P=U·I). For purely resistive circuits, the formulas P=I^2*R and P=U^2/R can also be used to calculate electrical power.
Extended information
1. P=W/t is mainly suitable for power calculation with known electrical energy and time
2. . P = UI is mainly suitable for power calculation with known voltage and current
3. P = U^2/R = I^2R is mainly suitable for pure resistance circuits
Generally. used for parallel circuits Or there is voltage and resistance variable to solve for electrical energy
4.P=I^2R is mainly used in pure resistance circuits
Generally used in series circuits where there is a variable in current and resistance. Electrical Energy Resolution
5.P=n/Nt is mainly suitable for electrical energy resolution with electrical energy meters and clocks
Reference documents:
You need to clearly distinguish whether it is the water energy utilization rate of the turbine or who can use it in the river basin; 1. The water energy utilization rate of the hydraulic turbine is the efficiency of the hydraulic turbine [1] Theoretical water flow Pm==9.8QH; (kilowatt) 2 Power plant power P==9.8QHq is the utilization rate (cubic meters per second) H effective height (meters), eta is the efficiency (...