The specific heat capacity of water is 4.2 times 10 cubic Joule, the density is 1.0 times 10 cubic kilogram per cubic meter, g = 10N per kilogram, the frequency is 50 Hz, the heating power is 1200W, the capacity is 1.2L. 1. The efficiency of self-priming pump is 60%. 2. The time of heating 1.2L water from 20 ℃ to 100 ℃ is 6 minutes,

The specific heat capacity of water is 4.2 times 10 cubic Joule, the density is 1.0 times 10 cubic kilogram per cubic meter, g = 10N per kilogram, the frequency is 50 Hz, the heating power is 1200W, the capacity is 1.2L. 1. The efficiency of self-priming pump is 60%. 2. The time of heating 1.2L water from 20 ℃ to 100 ℃ is 6 minutes,

1、E/W＝60%
That is: e = w / 60% = GH / 60% = MGH / 60%
＝ρgvh/60%
＝1000×10×0.0012×0.5/0.6＝10J
2. Q amplifier = Pt = 1200 × 6 × 60 = 432000j
Q suction = cm △ t = 4200 × 1.2 × (100-20) = 403200j
Efficiency: η = q suction / Q discharge = 403200 / 432000 = 93.33%
I don't know what to ask