Why is the current at 110V greater than the current at 220V 5

Now many electrical appliances are switching power supplies with a wide voltage range, 110V-240V can work normally, but as an established electrical appliance, the power consumption is often fixed, according to P=U*I, the power P is fixed, then the current that works at 220V is I(220), then the current working at 110V i(110) should be = I(220)*2.

i=u r, in the case of r unchanged, the larger u, the bigger i is, if you put the electrical appliances used at 110v under 220v, it will definitely burn out the electrical appliances because of excessive current.

According to the power calculation formula, the power consumed by the load is equal to the load voltage multiplied by the load current. The power remains the same, the voltage is low, and the current will of course become larger.

If the 110V appliance is directly put on the 220V, the consequence may be that the appliance will smoke directly.

i = current, u = voltage, r = resistance).

i=u r When u increases, the resistance of r is inconvenient, so i is bound to increase.

However, 110V rated electrical appliances cannot be connected to twice the voltage, and the increase in current will cause heat, according to Q (electric heating) = i r. The current is 2 times larger, and the electric heat is 4 times larger.

The consequences can be imagined.

It can be connected to multiple voltages.

This problem is related to the physics (whether it is 110V or 220V, the result of an electric shock will die, so this difference in voltage excludes safety considerations).

We all know that the resistance of the conductor of the same material is the same, in the case of resistance, the electrical energy consumed by the resistance will be converted into heat, and the energy consumption of the resistance is proportional to the current, in the case of constant resistance, the higher the voltage, the lower the current, this is the formula i=u r in the electricity of physics in middle school (many people have said).

The only thing that affects the power of the wire is the current, and the higher the current, the more powerful the wire, the most significant result is heating. Then when using 110 volts, the current is 10 amps, when the voltage is 220, the current is 5 amps, and when using 110 volts, the wire heats up more.

If it is connected to an AC220V power supply, its rated operating current is. Then connect it to the 110V power supply, then to reach 1kw of heat, its current must be there, so that the two sides of the calculation formula can be balanced. The thicker the wire, the less likely it is to burn, but the thickness of the wire also consumes costs, especially for long-distance transportation, the consumption cost is very large, and the loss of electricity will increase the cost virtually.

The higher the voltage, the thinner the wire. The thickness of the wire is mainly related to the current and does not have much to do with the voltage. Generally speaking, if the voltage is very high, the current does not need to be very large, so the conductor does not need to be particularly thick

Rongji igniter.

At the same power, the current can be reduced by half, and the heat generation can be reduced to a quarter of the original thickness of the cable without the same thickness. In this case, it is possible to switch to a thinner cable, which can reduce the diameter of the cable while it is safe. However, the voltage is much higher than this during transportation, and the maximum transmission voltage has reached 500kv, which is 47 times higher than the voltage, in fact, this is to reduce the loss in the transportation process, as well as reduce the transportation cost, which is the so-called copper saving.

Obviously, in order to reduce the loss of electricity, it is necessary to reduce the transmitted current or the internal resistance of the wire, because it is difficult to reduce the resistance of the wire, in order to reduce the internal resistance, it is necessary to increase the cross-sectional area of the copper wire, or improve the conductivity of the wire. <>

Through the above comparison of 110 volt power supply, compared with 220 volt power supply, the current is doubled, so the wire used will naturally be thickened, and the wire will be thickened by natural copper. Because the wires are basically made of copper.

This is because the low voltage causes the copper to be subjected to a higher temperature, so it is more scrap copper.

Because the same power is obtained, the higher the voltage, the lower the conductor cross-sectional area requirement, and the lower the voltage, the thicker the conductor cross-sectional area requirement! It's very simple, because the lower the voltage, the higher the current requirement, and the power of the line loss = i r

Differences:

If the frequency of electricity is the same, for example, 50Hz can be used normally, but if the frequency is different, for example, the electricity in some countries in Southeast Asia is 230V 50Hz single, so it cannot be used, the heating is very fast, and the possibility of burning out is greatly increased.

If an appliance with a rated voltage of 220V is connected to 230, the temperature is estimated to be very high. For example, the higher the voltage of the incandescent lamp, the greater the current, the greater the power consumption, the higher the voltage when the motor load is unchanged, the current decreases, so that the resistance of the motor coil consumes less electric energy, and the electricity consumption is reduced.

Comparison of 220V voltage vs 110V voltage:

1. Under the condition of constant resistance, the lower the voltage, the greater the current, and the wire is easy to heat. If the wires are not thickened, it is easy to cause fire. Therefore, 110V power lines and electrical appliances need to have a smaller resistance, which consumes a lot of copper.

With the rapid development of the power industry, high-voltage transmission is generally used for long-distance transmission in various countries, often tens of hundreds of kilovolts, in order to reduce the current and reduce the loss of wires. From this point of view, although there are some gaps in energy conservation and environmental protection between countries using 220V and countries using 110V, after all, long-distance transmission is carried out by high-voltage transmission, so this gap is actually very small.

2. Security.

In dry conditions, 36V is considered a safe voltage, and in harsh environments, the safe voltage drops to 24V or even 12V. In the event of an electric shock, the real determination of safety is the amount of current that passes, so whether there is a danger depends more on the electric shock environment.

In principle, the lower the voltage, the safer it is. Someone has calculated that in terms of the time to produce pathophysiological reactions and even fatal hazards to the human body, 110V does take longer than 220V, a difference of about 100 milliseconds. But in reality, both 110 volts and 220 volts are well out of the safe voltage range.

The relatively low voltage of 110V is already three times higher than the safe voltage.

3. Applicability.

Ordinary electrical appliances belonging to the same voltage system are brought abroad for use, and the voltage is generally not a problem, because most electrical appliances have a voltage fluctuation range of 20%. Such as electric stove, electric Jianchang liquid rice cooker. Even in Japan, the voltage can reach up to 250 volts.

We brought the 220v electric stoves to the 230v voltage area to use them, no big problem, just to make them heat up faster.

Summary. When the nominal voltage is 220V, the appliance works at 110V, it will definitely not work properly. As for whether it will be damaged, it depends on the specific appliance.

When the nominal voltage is 220V, the electrical appliance works at 110V, and it must not work normally. Whether the jujube will be damaged depends on the specific electrical appliances.

This kind of motor will be burned out.

The switches and motors are all 220V, but the relay is 110V.

Dear, then there is no problem, it will not burn out.

No problems were found during the test run.

That's right, dear, so it won't burn out, and it can be used.

This means that if a 110V switch is used for a 220V relay for the motor, it won't work, right?

If you can test it, you won't have a problem, right?

Dear, yes.

Because some of them will burn out.

The voltage is too large.

The maximum value is:

Ohm's Law: 1. Overview.

In AC circuits, the relationship between the peak value or RMS value of voltage and current is similar to Ohm's law in DC circuits, and the equation is u=iz or i=u z, where z and u are both RMS values of AC current, and z is impedance, which is Ohm's law in AC circuits.

2. Notes. Since voltage and current have phase differences depending on the component, the effective values of voltage and current are generally not proportional to the simple quantity.

3. In the series circuit, as shown in the figure, taking R, L, and C as examples, the total voltage is not equal to the sum of the voltages of each segment, U≠UR+UL+UC. Because the voltage phase at both ends of the inductor is ahead of the current phase conductive capacitor voltage phase 2 and behind the current phase 2. Therefore, the total voltages on r, l, and c are by no means the algebraic sum of the voltages on the individual components, but the vector sum.

4. In terms of pure resistance, zr=r

6. The relationship between the current of each shunt and the voltage at both ends is that the phase of the current on different components is also different.

7. The current phase on the pure inductor lags behind the pure resistance current phase, and the current phase on the pure capacitor is ahead of the pure resistance current phase. So the vector sum of the dividing currents is the total current.

In general, when describing alternating current voltage, unless otherwise specified, the default value is a valid value. The same is true for household 220v electricity, which refers to the RMS. Multiplying the RMS value of sinusoidal alternating current by 2 under the root number gives the maximum value. 220v 2=

220 volts AC at peak voltage of 220* volts.

What is the maximum value of 220 volts AC voltage? Valid values.

What we mean by the voltage of sinusoidal alternating current is 220V, which refers to the RMS.

The expression of the function asks: 220*(root number2)sin(wt+ start phase), we can see that its maximum value is 220*(root number2)=311v, and the value measured with an AC voltmeter is a valid value, which is 220v