Which brand of electric vehicles manufactured in Taizhou is the right one?

Lvjia electric vehicles focus on battery life and comfort, while Lima electric vehicles focus on interior configurations.

According to the house of electric vehicles, Lujia electric vehicles are equipped with a 48V20Ah lithium iron phosphate battery, with a maximum range of about 75 kilometers. The seat cushion is top of the line. PU leather material, so it's good.

Lima electric vehicles are equipped with German Bosch motors, which have strong power, hydraulic shock absorption and real empty tires, so they are good.

(1) The maximum current in salt water is approximately I=

E

R

=

3.7

2000

=0.00185A=1.85mA,

The ammeter is optional: ammeter A2 (range 2mA, resistance RA2 is about 50Ω);

For ease of operation, the sliding rheostat should be selected with a smaller maximum value: R1: maximum resistance 40Ω

(2) During the experiment, the volume V of the salt water remains unchanged,

< p>∵V =SL, ∴ cross-sectional area of ​​salt water S=

V

L

The resistance of salt water R=ρ

< /tr>=ρ

L

S

< td>V

L2

We see that the dresistance R is proportional to L2,

The physical quantity represented on the abscissa is L2

R=.

L

S

=ρ< td style="border-bottom:1px plain black;padding-bottom:1px;font -size:90%">L2

V

So the slope k=

ρ

V

So ρ=kV

< p>The answer is therefore: (1)A2;?R1;

(2)①L2;?②kV