How to judge whether sliding rheostat is current limiting connection or partial compression connection

The solution of partial voltage in series with resistor or other components
Solution of current limiting in parallel with resistor or other elements

On current limiting or partial crimping method of sliding rheostat
The electromotive force of the power supply is much larger than the range of the voltmeter. When the sliding rheostat is adjusted to the maximum value and still exceeds the range of the voltmeter (the meter must be burned)
In this case, it is necessary to use the partial crimping method
If we use the partial voltage connection method, as long as there is a current, will the voltmeter still be finished? (the parallel voltage is the same.)

Explain the partial crimping method of sliding rheostat

Connect the positive and negative sides of the power supply to the two pin connected bulbs (i.e. load or resistance) at the negative end under the sliding rheostat, and then connect the other end to the slide of the sliding rheostat

The problem of sliding rheostat partial crimping in high school physics circuit
What's its working principle? Isn't the voltage in parallel the same everywhere? How to divide the voltage?

A sliding rheostat can be regarded as a series of fixed resistors, not in parallel. The sliding slider is equivalent to changing the contact position of the contact in the series resistor
Because the total voltage of series circuit is equal to the total voltage of each sub circuit, each different point has different voltage value, changing the contact will change the voltage
Both sides of the contact can be regarded as a voltage divider composed of two different resistors

How to judge whether sliding rheostat is current limiting connection or partial compression connection