{"id":98021,"date":"2022-01-16T02:15:33","date_gmt":"2022-01-16T00:15:33","guid":{"rendered":"https:\/\/gahzly.com\/%d9%83%d9%8a%d9%81-%d8%aa%d9%82%d9%8a%d8%b3-%d8%a7%d9%84%d8%ac%d9%87%d8%af-%d9%88-%d8%a7%d9%84%d8%a7%d9%85%d8%a8%d9%8a%d8%b1-%d8%a7%d9%84%d9%83%d9%87%d8%b1%d8%a8%d8%a7%d8%a6%d9%8a\/"},"modified":"2023-12-26T14:08:51","modified_gmt":"2023-12-26T12:08:51","slug":"how-to-measure-voltage-and-amperes","status":"publish","type":"post","link":"https:\/\/gahzly.com\/en\/\u0645\u0642\u0627\u0644\/how-to-measure-voltage-and-amperes\/","title":{"rendered":"How to measure voltage and amperes"},"content":{"rendered":"

How to measure voltage and amperes<\/span><\/span><\/b><\/h1>\n

\"HowHow to measure voltage and amperes<\/span><\/span><\/b><\/h2>\n

How do you measure electrical voltage? There are two types of voltages that electrical and electronic circuits operate on: alternating voltage and direct voltage.<\/span><\/span><\/span><\/p>\n

There is a device dedicated to measuring voltage in practice, and each type of voltage has a method that differs from the other, meaning when measuring direct voltage, the multimeter must be set to the direct voltage measurement mode to perform the measurement process, and so on with alternating voltage.<\/span><\/span><\/span><\/p>\n

The aim of this topic is to explain how to measure electrical voltage practically and using a multimeter, which is also called a multi-function measuring device.<\/span><\/span><\/span><\/p>\n

What is a multimeter?<\/span><\/span><\/b><\/h2>\n

It is an important device that any technician working in the field of electricity, electronics, batteries, solar energy, and electrical control cannot do without.<\/span><\/span><\/span><\/p>\n

This device is used to measure most electrical parts, such as: checking home and industrial electricity networks, checking source voltage and resistors, and all electronic parts such as: resistors, transistors, diodes, and many, many different parts.<\/span><\/span><\/span><\/p>\n

What we mean in this topic is to explain in detail how to measure direct current and alternating current electrical voltage.<\/span><\/span><\/span><\/p>\n

Multimeter sensors<\/span><\/span><\/span><\/p>\n

The difference between a manual and an automatic multimeter<\/span><\/span><\/span><\/p>\n

\"\"How to measure direct voltage (DC)<\/span><\/span><\/b><\/h2>\n

There are several important steps that must be followed in order to measure the continuous voltage of the battery, for example as follows:<\/span><\/span><\/span><\/p>\n

    \n
  • Place the device’s red probe into the port designated for voltage, which is symbolized by the letter (V).<\/span><\/span><\/span><\/li>\n
  • Place the black probe into the common (COM) port.<\/span><\/span><\/span><\/li>\n
  • Turn on the multimeter by pressing the power key if it has a power key, and if it does not, all you have to do is move the cursor key only for it to work.<\/span><\/span><\/span><\/li>\n
  • Place the multimeter pointer on the constant voltage symbol \u201cVolt\u201d (V).<\/span><\/span><\/span><\/li>\n
  • If the multimeter is of the manual adjustment type, that is, the voltage measurement range is controlled manually, place the pointer at a voltage value higher than the battery voltage value you expect or the value written on the surface of the battery.<\/span><\/span><\/span><\/li>\n
  • Place the red probe of the multimeter on the positive (+) terminal of the battery, while the black probe on the negative (-) terminal of the battery.<\/span><\/span><\/span><\/li>\n
  • The battery voltage reading will appear on the device’s screen, and if the reading value is approximately the same as the voltage written on the battery, this indicates that the battery is good.<\/span><\/span><\/span><\/li>\n<\/ul>\n

    Constant voltage measurement method (battery voltage)<\/span><\/span><\/span><\/p>\n

    How to measure alternating voltage (AC)<\/span><\/span><\/b><\/h2>\n

    Follow these steps:<\/span><\/span><\/span><\/p>\n

      \n
    • Place the red probe in the voltage port (V).<\/span><\/span><\/span><\/li>\n
    • Place the black probe into the COM port.<\/span><\/span><\/span><\/li>\n
    • Turn on the multimeter, place the scale switch on the alternating voltage with a sine wave drawn on it and the letter (V) next to it.<\/span><\/span><\/span><\/li>\n
    • Place the two multimeter probes (red and black) in parallel with the household electrical socket (vase and socket) without paying attention to the polarity, because it does not have polarity like a battery.<\/span><\/span><\/span><\/li>\n
    • You will be shown the source voltage value in AC voltage.<\/span><\/span><\/span><\/li>\n<\/ul>\n

      How to check step-down transformers<\/span><\/span><\/b><\/h1>\n

      \u00a0How to check step-down transformers<\/span><\/span><\/span><\/p>\n

      How to check step-down transformers: We often see electrical transformers in most electronic boards, the most famous of which are step-down transformers.<\/span><\/span><\/span><\/p>\n

      In this context, we will learn about a simplified method for checking any small voltage-reducing transformer that you may want to service after disconnecting its terminals from the electronic board.<\/span><\/span><\/span><\/p>\n

       <\/p>\n

      Step-down transformers<\/span><\/span><\/b><\/h2>\n

      You usually find in most electronic devices, such as radios, televisions, battery chargers, and other electronic boards, an important element called a step down transformer.<\/span><\/span><\/span><\/p>\n

      The voltage-reducing transformer comes with four or five terminals, and you may find more than that. What we need to examine is the voltage-reducing transformer with four terminals (two terminals, primary coil – two terminals, secondary coil).<\/span><\/span><\/span><\/p>\n

      Four-pin step-down transformer<\/span><\/span><\/span><\/p>\n

      The two ends of the primary coil are called the input, while the two ends of the secondary coil are called the output. The difference is between a transformer designed with four terminals, which has two input terminals and two output terminals, while a five-terminal transformer has two input terminals (primary coil) and three output terminals (secondary coil).<\/span><\/span><\/span><\/p>\n

      Five-pin voltage reducer coil<\/span><\/span><\/span><\/p>\n

      Step-down transformer function<\/span><\/span><\/b><\/h2>\n

      The basic function of the step-down transformer is to reduce the voltage of the 220VAC\/110VAC power supply,<\/span><\/span><\/span><\/p>\n

      To a lower voltage value in order to supply the entire circuit or a specific part of the electronic circuit.<\/span><\/span><\/span><\/p>\n

      We cannot fail to note that the transformer only lowers the voltage while keeping the current alternating.<\/span><\/span><\/span><\/p>\n

      Steps for checking step-down transformers<\/span><\/span><\/b><\/h2>\n

      The process of examining step-down transformers is based on the following points:<\/span><\/span><\/span><\/p>\n

        \n
      • Ensure that the adapter is not connected to the electricity source.<\/span><\/span><\/span><\/li>\n
      • Disconnect the transformer if it is connected to an electronic circuit.<\/span><\/span><\/span><\/li>\n
      • When examining the transformer, the resistance of the primary coil and the resistance of the secondary coil must be measured.<\/span><\/span><\/span><\/li>\n
      • Turn on the multimeter and place the key indicator on the resistance symbol.<\/span><\/span><\/span><\/li>\n
      • If the device has a reading scale, set a resistance value of 1k, or 200 ohms if the reading appears at a small value.<\/span><\/span><\/span><\/li>\n
      • Place the probes of the multimeter on both ends of the primary coil, regardless of polarity.<\/span><\/span><\/span><\/li>\n
      • The device reading appears to be in the range of hundreds or a few tens of ohms.<\/span><\/span><\/span><\/li>\n
      • While when measuring the resistance of the secondary coil by placing the probes on its ends, you will see a reading that is much smaller and in the range of ohms (less than ten ohms).<\/span><\/span><\/span><\/li>\n
      • The transformer is damaged if the resistance of the primary or secondary coil is very large, i.e. an open circuit, or zero ohms, i.e., a short circuit.<\/span><\/span><\/span><\/li>\n<\/ul>\n

        In line with what was mentioned in the examination steps, a reading of 399 ohms appeared when measuring the resistance between the two ends of the primary coil.<\/span><\/span><\/span><\/p>\n

        While when measuring the resistance of the secondary coil, we got a reading of 2 ohms.<\/span><\/span><\/span><\/p>\n

        How to check the primary file<\/span><\/span><\/span><\/p>\n

        How to check the secondary file<\/span><\/span><\/span><\/p>\n

        We conclude from the above that the resistance value of the primary coil is always greater than the resistance value of the secondary coil, noting that these values \u200b\u200bmay differ by the number of turns of both the primary coil and the secondary coil.<\/span><\/span><\/span><\/p>\n

        \"\"How do you measure amperes in practice?<\/span><\/span><\/b><\/p>\n

        How-to-measure-amps-in-practice<\/span><\/span><\/p>\n

        How do you measure the ampere? In practice, the electric current that is measured in the ampere unit is considered one of the important electrical units that is not devoid of any electrical or electronic circuit.<\/span><\/span><\/p>\n

        All circuits carry electrical current in the form of direct current or alternating current, depending on the type of current and circuit.<\/span><\/span><\/p>\n

        This topic aims to explain how to measure amperes in practice for any electrical circuit that you may want to measure using a multimeter that is set to the ampere measurement mode.<\/span><\/span><\/p>\n

        Multimeter device<\/span><\/span><\/p>\n

         <\/p>\n

        What is the unit ampere?<\/span><\/span><\/b><\/p>\n

        The ampere unit is considered one of the basic quantities and is widely used in electrical circuits, and it is the unit of measuring electric current.<\/span><\/span><\/p>\n

        Electric current can be defined as the rate of flow of electrons in a circuit from one point to another through a conductor.<\/span><\/span><\/p>\n

        The unit of electrical current, \u201campere,\u201d is symbolized by the letter (A).<\/span><\/span><\/p>\n

        How do you measure amperes?<\/span><\/span><\/p>\n

        Before going into the practical details, it is necessary to learn about the most important things that you must know about measuring the amount of ampere that flows within the circuit.<\/span><\/span><\/p>\n

        As we know, when measuring the resistance value, source voltage, and battery, the terminals of the multimeter probes are connected in parallel with the elements to be tested.<\/span><\/span><\/p>\n

        But this does not happen in the same way when measuring amperes in a circuit.<\/span><\/span><\/p>\n

        The ampere is measured by connecting the two ends of the multimeter device (red and black) in series with the item to be measured, by separating the path you want to measure, as shown in the simplified figure.<\/span><\/span><\/p>\n

        How to connect an ampere meter to a circuit<\/span><\/span><\/p>\n

        Steps to measure amperes in practice<\/span><\/span><\/p>\n