How to distinguish between high and low temperature in a physical circuit

The high temperature gear and the low temperature gear mainly refer to the high and low energy emitted, and the general household circuit voltage remains unchanged, so according to p u2 r, when the resistance r in the circuit becomes smaller, that is, p is large, it is the high temperature gear at this time; When the resistance r in the circuit becomes larger, p becomes smaller, which is the low temperature gear.

According to Joule's law.

The heat is proportional to the square of the current, proportional to the resistance, and proportional to the time of energizing. It is also reflected in the formula that the effect of electric current on heat is a squared effect. That is, the effect of a change in current on the heat produced is greater than that of resistance.

The effect of change on heat is greater.

Therefore, if the current in both states is the same, (note that the current is not the voltage), the resistance is large.

more, as a high temperature gear.

Usually the test questions are different currents and the same voltage. Then it is considered that the current with large resistance is small, and the heat is less, which is regarded as a low temperature gear.

In the circuit, it will generally have a switch on the branch, and there will also be a switch on the dry road, when the switch on the branch is closed, you can know that the two resistors are in parallel. At this time, the resistance is small and the electrical power is large. At this time, it is a high temperature gear, after the switch of its branch is disconnected, the two resistors are connected in series, then at this time, the resistance is large and the electrical power is small.

It can be clearly judged that this is a low temperature gear.

The high temperature level is the one with the highest measurement resistance or voltage. Give it satisfaction!

Judged by p=u2 r.

When the resistance value r is very small, that is, the total resistance value in the circuit is very small (it may be in the case of parallel connection), p is very large, and it is a high temperature gear.

When the resistance value r is very large, that is, when the total resistance value in the circuit is large (it may be in the case of series connection), p is very small and it is a low temperature gear.

The Chinese file is between the high temperature gear and the low temperature gear, and the general household appliances will give specific values.

1.Temperature judgment: In general, high temperature refers to a higher temperature, and low temperature refers to a lower temperature.

The specific criteria for judging can be determined according to the different fields of application and the properties of the substance. For example, in the atmosphere, high temperature can refer to a temperature that exceeds normal temperature (usually 20-25 degrees Celsius), while low temperature can refer to a temperature below normal temperature. In the laboratory, the criteria for judging high and low temperatures may be different.

2.Phase change judgment: A substance undergoes a phase change at different temperatures, such as a solid becoming a liquid or a gas.

Generally speaking, the phase change is more likely to occur in the high temperature state, while the substance is more likely to remain solid in the low temperature state. Therefore, if the substance is in a liquid or gaseous state, it can be judged as a high-temperature state; If the substance is in a solid state, it can be judged to be in a low temperature state.

3.Judgment of physical properties: Different substances may exhibit different physical properties at high and low temperatures.

For example, certain substances can melt or thermally expand at high temperatures, while at low temperatures they become fragile or shrink. By observing the changes in the physical properties of a substance, it is possible to determine the temperature range in which it is located.

It is important to note that the specific criteria for judging high and low temperatures may vary depending on the field and application. In specific situations, the relevant temperature standards, material properties and experimental data can be referred to to make judgments. <>

Brand model: Huawei P50 Pocket System: HarmonyOS 3

The high temperature gear and the low temperature gear mainly refer to the high and low energy emitted, and the general household circuit voltage remains unchanged, so according to p u2 r, when the resistance r in the circuit becomes smaller, that is, p is large, it is the high temperature gear at this time; When the resistance r in the circuit becomes larger, p becomes smaller, which is the low temperature gear.

Voltage, also known as potential difference or potential difference, is a physical quantity that measures the difference in energy between a unit charge in an electrostatic field due to different potentials. The magnitude of the voltage from one point to another is equal to the work done by the unit positive charge to move from one point to another due to the action of the electric field force, and the direction of the voltage is specified as the direction from the high potential to the low potential. The SI unit system of voltage is volts (V, referred to as volts), and the commonly used units are millivolts (mV), microvolts (V), kilovolts (kv), etc.

The resistance of a conductor to an electric current is called the resistance of the conductor. Resistance is a physical quantity that in physics indicates the magnitude of a conductor's action on the resistance of an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current.

Different conductors, the resistance is generally different, and resistance is a property of the conductor itself. The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, referred to as ohm, and the symbol is .

For judging the high-temperature, low-temperature and medium-temperature gears, we need to first understand the principle of the temperature setting of electrical appliances. In some household appliances, such as electric fans, electric heaters, etc., there will be temperature gear settings. By adjusting the temperature level, the operating state of the electrical appliance is controlled to reach the required temperature value.

Generally speaking, the temperature range settings of electrical appliances are generally divided into high, medium and low levels, and the specific temperature range will vary depending on the appliance itself.

To judge the high temperature, low temperature and medium temperature range, we can judge by the following aspects:

1.Look at the temperature gear identification: Generally, electrical appliances will mark their temperature gear on the outside, and we can judge whether the gear is high, medium and low by looking at the logo.

2.Feel the surface of the appliance: After turning on the appliance, we can touch the surface of the appliance to feel its temperature.

If it's hot to the touch, then it's likely to be a high temperature range; If the temperature is moderate, then the gear is likely to be a medium temperature range; If it's cool to the touch, then it's likely to be a low gear.

3.Use an infrared thermometer: An infrared thermometer can directly measure the temperature of the appliance to obtain the temperature value of the surface of the appliance. By comparing the values, we can accurately determine the level of the temperature range.

In general, we can help us judge the level of electrical temperature level through the three methods of identification, feel and infrared thermometer. Through the accurate judgment of the temperature level, we can better control the operation status of the electrical appliances to achieve the temperature effect we need. <>

The utilization power supply BAI voltage does not change:

p=u^2/r

The smaller the r, the greater the p, du

It is the heating zhi state dao.

The larger the r, the smaller the p, which is the state of the plate temperature.

The total resistance weight value of the circuit in the high temperature mode is small (i.e., there are two fixed-value resistors in parallel) The total resistance of the circuit in the low temperature mode is large (that is, there is only one resistor).

The utilization of the power supply voltage is unchanged

p=u^2/r

The smaller the r, the larger the p, which is the heated state.

The larger the r, the smaller the p, and it is in a state of insulation.

The utilization of the power supply voltage is unchanged

p=u^2/r

The smaller the r, the larger the p, which is the heated state.

The larger the r, the smaller the p, and it is in a state of insulation.

The voltage of the electric source is unchanged

p=u^2/r

The smaller the r, the larger the p, which is the bai heating state du.

The larger the r, the smaller the p, which is the state of heat preservation.

The total resistance value of the circuit in the high temperature gear is small (i.e., there are two DAO fixed value resistors in parallel) and the total resistance of the circuit is large in the low temperature mode (that is, there is only one resistor).

Tandem can also be done by simply shorting one of them.