AC220 / 110V / 50Hz / 60Hz / DC5V / 500mA / 400mA, how many negative power supplies is this This is a digital calendar transformer

AC220 / 110V / 50Hz / 60Hz / DC5V / 500mA / 400mA, how many negative power supplies is this This is a digital calendar transformer

110, 220 can be used, now the general electrical appliances are like this

When the frequency of working power supply of electromagnetic dot timer is 50 Hz
If the power frequency becomes low, is the interval of the timer greater than 0.02s or less than 0.02s? Is the speed calculated according to the tape larger or smaller?

When the time is greater than 0.02s, the calculated acceleration becomes larger, because you still use 0.02s to calculate the actual time. When the time is greater than 0.02s, the displacement changes too much
This process without detailed solution is to understand it, because you don't know how many seconds it is

Why is it that when the power supply frequency of the clock is 50 Hz, the clock should be started every 0.02 seconds

Because Hz refers to the number of periodic movements in one second, and 50 Hz refers to the number of periodic movements of the electromagnetic relay in one second. Therefore, dividing one second by 50 is equal to 0.02 seconds, that is, a point is made every 0.02 seconds

If we use a timer with a power frequency of 50 Hz, we suddenly find that when the power frequency is lower than 50 Hz, the data calculation is still processed by hitting a point every 0.02 seconds, then the measured speed is larger or smaller than the actual speed? Why?

The calculation speed is too high
Suppose the frequency changes to 25Hz
In fact, the distance between two points is 0.04 seconds. If the calculation is still based on 0.02 seconds, the calculated speed is larger than the actual value