Measuring is an activity that is closely related to experimentation. When measuring, the value of a variable, ie the degree of expression of a property, is determined with the aid of a measuring device by comparing the variable to be measured with a specified unit - do my homework. For this purpose, a measurement specification is usually specified.
Example 1:
When measuring the current with a multimeter you should proceed as follows:
Set the type of current (direct current or alternating current) present in the circuit on the measuring device!
1. Set the largest measuring range for the amperage on the measuring device!
2. Connect the measuring device in series to the electrical device in the circuit in which the electrical current is to be measured! With direct current, make sure that the negative pole of the electrical source is connected to the negative pole of the measuring device and the positive pole of the electrical source is connected to the positive pole of the measuring device!
3. Complete the circuit and then switch the measuring range on the measuring device down so that the pointer is as close as possible to the last third of the scale! The measurement error is smallest in this area.
4. Read the amperage! Please note that the set measuring range indicates the maximum value on the scale.
Example 2:
When measuring the volume of a liquid with a graduated cylinder, you should proceed as follows:
1. Guess the volume of the liquid! Choose a suitable measuring cylinder based on this estimate!
2. Fill the liquid into the measuring cylinder and place it on a horizontal surface!
3. Bring your eyes level with the surface of the liquid! Read the level at the deepest point on the surface of the liquid!
When measuring, it should also be noted that every measuring device has a certain measuring accuracy. Measured values are therefore always only approximate values for the true value of a quantity - chemistry problem solver. If you want to measure a value of a quantity as precisely as possible, there are different options:
- The conditions and the measuring devices are selected so that a high accuracy in the measurement is possible.
- Instead of a single measurement, a series of measurements is carried out. In this way, random fluctuations in the measured values around the true value of the variable can be taken into account.
Note:
The accuracy of a measurement can only be influenced in the preparation and execution of the measurement - homework help science. Error observations carried out after the measurement allow an assessment of the accuracy, but not how it can be influenced. Measurements that are as accurate as possible therefore require appropriate considerations before the measurement.
See also:
Activities in physics: Establish
Gaining knowledge in chemistry: Classify
Labor Parliament and Speech Parliament
The art of teaching programming
Net present values, calculating