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When we study electricity and magnetism, we will encounter the formula in computing for the electric current. This formula is known as the Ohm’s law. This law states that there is a direct proportion between the electric current and the electrical pressure. It also states that there is an indirect proportion with regards to the electric current and the circuit resistance. The simplified explanation for this formula is that amperage is equal to volts divided by ohms.

By applying this concept, we can now use a meter to calculate amperage and wattage that is used up by the equipment. For this goal we will use a multimeter to gauge the resistance and voltage levels of a device which is relevant data in computing the amperage and wattage of an appliance.

You should turn off the power supply in the device’s circuit first. Then you will use the multimeter. Set your multimeter to the resistance setting. The Greek letter of omega is the symbol used for this setting.

We will then use the multimeter’s negative probe to touch one of the terminals of the device. Then we will touch the other terminal with multimeter’s positive probe. Afterwards, we will wait for the multimeter’s read out. This read out is the value of the circuit’s resistance in terms of ohms.

You will now measure the voltage of the equipment. You need to set the multimeter to the voltage setting. Before you start measuring the voltage, you must first determine how is the device being powered. If this device uses battery, dynamo, solar cell, solar panel, or transformer, then you have to put the multimeter’s voltage to direct current or DC. If the device uses an outlet or generator, set the multimeter voltage to alternating current or AC.

Before proceeding, we should turn on the device’s power supply. Then we will use the negative probe of the multimeter to touch the negative terminal of the power supply and the positive probe to touch the positive terminal of the device’s power supply. We will then wait for the multimeter’s read out. This read out is the electrical pressure in terms of volts.

We will now apply ohm’s formula on the data we have measured. We will divide the value of the voltage by the value of the resistance and we will get the amperage. The amperage is the value of the energy consumed by the device.

To get the wattage, you have to multiply the amperage by the value of the voltage and the resulting product is called the wattage or the power rating of the device. That is how you compute the value of amperage and wattage using a meter. You can now record these values for future use.

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