Xiao Min designed a simulated record of evidence of red light violations。。。。。。。。。。。。。。。。。。 Add anoth

Hello, based on the question you gave I can only guess that the varistor is connected in series with the armature, but I think there should be a diagram of the resistance of the varistor versus the pressure on which it is subjected.

with u=irr=6v

600 euros. 600-10 = 590 euros.

The pressure on the varistor at this time can be determined from the image.

Drawings can be attached if conditions permit. But that's pretty much the way to solve the problem.

Glad to help you.

Your thinking is too backward, and people are now using high-frequency sensing. Far more reliable than your energy saving.

There is no scientific basis for how many kilograms of mass you are looking for when a vehicle can be photographed when driving in violation of regulations. That's sensor technology. It doesn't matter how much weight it weighs, as long as the sensitivity of the sensor is appropriate and the amplification gate circuit is controlled, the decision to turn on or off can be made.

You're too far behind in your thinking.

According to Ohm's law, the total resistance in a circuit i=u r is: r total = u i = 6v = 100

The resistance value of the varistor is: r = 100 -10 = 90 It can be seen that when r = 90, the pressure of the varistor is f = 4000N, according to g = mg: m = g g = f g = 4000n 10n kg = 400kg

A: Only vehicles with a mass of more than 400 kg will be photographed and recorded when they are in violation

To record the violation of a red light, the light switch should automatically close when it receives a red light.

Vehicles with a mass of less than 400kg will not be photographed and recorded in case of violations.

1) According to the working principle, connect the circuit completely.

2) To record the scene of running a red light in violation of regulations, the light control switch should automatically close when it receives a red light (fill in "red", "green" or "yellow").

3) As can be seen from Figure B, the resistance value of the varistor R decreases with the increase of pressure 4) It is known that the voltage of the control circuit is 6V, and the resistance of the relay coil is 10 ohms, and when the current in the control circuit is greater than ampere, the armature is attracted. By calculating the explanation, only vehicles with a mass of more than how many kilograms will be photographed and recorded.

Solution: i u r

r total u i 6v

Varistor r 100 -10 90

According to the map, f 4 103n

m＝g/g＝f/g＝4×103n/10n/kg＝400kg

(2) Because the electronically controlled camera should automatically record the scene of running a red light in violation of regulations, the light control switch should automatically close when receiving the red light;

As can be seen from Figure B, the abscissa is the pressure value of the varistor, and the ordinate is the resistance value, as can be seen from the figure, when the pressure of the varistor increases, its resistance value decreases;

3) Total resistance of the control circuit:

r total u i 6v

100, the resistance value of the varistor is:

r=r total -r0=100 -10 =90, check the figure to know that when r=90, the pressure of the varistor f=4000n, the mass of the car:

m=gg=fg

4000n10n/kg

400kg．

Answer: (1) The circuit diagram is shown in the above figure;

2) red; Minish;

3) Only vehicles with a mass of more than 400 kg will be photographed and recorded when they are violated

(2) Because the electronically controlled camera should automatically record the scene of running a red light in violation of regulations, the light control switch should automatically close when receiving the red light;

So the answer is: red

3) As can be seen from Figure B, the horizontal axis is the pressure value of the varistor, and the vertical axis is the resistance value, and it can be seen from the figure that when the pressure of the varistor increases, its resistance value decreases

So the answer is: decrease

4) According to Ohm's law i=u

The total resistance in the R circuit is: R Total = UI = 6V

The resistance value of the varistor is: r=100 -10 =90 It can be seen that when r=90, the pressure of the varistor f=4000N, according to g=mg: m=gg=f

g=4000n

10n/kg

400kg A: Only vehicles with a mass of more than 400kg will be photographed and recorded when they are in violation

(1) According to the question, the electronically controlled camera should automatically record the scene of running a red light in violation of regulations, so to record the scene of running a red light in violation of regulations, the light control switch should automatically close when receiving a red light;

2) According to Ohm's law i=er total.

The total resistance in the circuit is: r total = ei = 6

The resistance value of the varistor is: r=100 -10 =90 It can be seen that when r=90, the pressure of the varistor f=4000N, according to g=mg: m=g

g=400kg

So the answer is: (1) red; （2）400．

a, b, because the electronically controlled camera should automatically record the scene of running a red light in violation of the law, so the light control switch should be automatically closed when receiving the red light; When receiving green light, the light control switch is disconnected, the indicator light is illuminated, and the electronically controlled camera does not work, all of which are in line with the topic;

c. According to Ohm's law i=u

The total resistance in the r circuit is: r total. =ui

The resistance of the varistor is: r = 100 -10 = 90

It can be seen that when r=90, the pressure of the varistor f=4000N, according to g=mg: m=gg=f

g=4000n

10n/kg

400kg, therefore, only vehicles with a mass greater than 400kg will be photographed and recorded when they are violated, which is in line with the topic;

D, the analysis of Figure B can be seen, when the pressure f is smaller, the greater the resistance r, if a series of resistance, according to the total resistance in the series circuit is equal to the sum of the series resistance, then the total resistance in the circuit is larger, the current will be smaller, can not reach, the electromagnet can not effectively control the armature, then can not achieve the purpose of taking pictures of the illegal vehicle, so it is not in line with the topic

Therefore, A, B, and C are chosen

(1) According to the question, the electronically controlled camera should automatically record the scene of running a red light in violation of regulations, so to record the scene of running a red light in violation of regulations, the light control switch should automatically close when receiving a red light;

2) According to Ohm's law i=er total.

The total resistance in the circuit is: r total. ei

The resistance value of the varistor is: r=100 -10 =90 It can be seen that when r=90, the pressure of the varistor f=4000N, according to g=mg: m=gg

400kg, so the answer is: (1) red (2) 400

1) If you prepare a group to pay respect:

2) red; 3) Decrease or cherry blossom imitation caution.