Traditional means of transportation in Guanzhong rural areas

(1) The battery of the electric bicycle is a storage battery, so the charging process of the electric bicycle is to convert electric energy into chemical energy;

The discharge process of electric bicycle is to convert chemical energy into electrical energy and then into mechanical energy of electric bicycle.

(2)① Traction force of electric vehicle f = f = 0.02g = 0.02× (700n+300n) = 20n;

②∫P = UI

Working current of electric bicycle under rated power: I = p amount u amount = 200W36V ≈ 5.56a. 。

(2) The work done by traction is W motion = FS = 20n×2400m = 48000j；;

∫P = weight

∴ the power consumption is W=Pt=200W×300s=60000J.

Electric vehicle efficiency η = w = w = 48,000 j 60,000 j×100% = 80%. % = 80%.

Answer: (1) electricity; Chemistry; Chemistry; Electricity; Machinery;

(2) The traction of the electric vehicle is 20N；; The rated current for normal operation is 5.56A 。

(3) 48,000 J of traction work; The efficiency of electric vehicles is 80%.