Voltage is the potential measurement of electric current between two points, between your main electric supply and the outlet socket or between the outlet socket and your device.
Electricity is used a lot for cooling and warming homes, plugging in air conditioning devices, radiators, boilers, sometimes electric hotplates, hoods, and vacuums.
These devices are all high-power consumers. You can check the voltage of your household circuitry or your appliances or batteries.
You need a digital or analog multimeter, or a voltmeter to check the voltages.
PROCESS TO CHECK THE VOLTAGE IN A MULTIMETER
But the voltmeter is meant to check voltage only. In our case we are going to check the 240 voltages, we use a multimeter device. It contains a selector dial in the centre of the device. It can rotate up to 360 degrees. It contains distinct functions to select, for example, A/C voltage check, D/C battery check etc.
- If you are new to a multimeter, then read the manual guide to select the variable functions of a multimeter. We use two ports, that is red and black ports in a multi-meter device to operate the multiple functions and get the desired measurements. The black port is Common whereas the red port is live or powered. In addition to this, there are two probes red and black in colour, the other end of both the probes is an inlet, like an insert of a lead (Probes come together with a multimeter).
- We will check 240 voltages by these two black and red probes together with the two black and red ports within the body of a multi-meter device to complete the circuit to check the voltage. To start checking our voltage we should know the precautions first.
- Do not touch a test probe with the metal part, or you could shock yourself. The multimeter will start by creating a circuit to measure voltage, so do not make yourself a part of that circuit, so you would not be shocked. Ensure that the multimeter dial selector is set to measure the voltage selector before attempting to do so.
- If the multimeter is set to measure amps or ohms, it may damage when connected to a voltage source. Today we are checking the A/C current; as you can select it from the symbol, choose the auto range in your multimeter, it is much easier to test a particular voltage. Select the outlet to select the voltage. You will place your multimeter leads into the outlet; as you can see by testing this, we have 240 volts that means there are 240 volts of power available to the outlet, so now we are going to try voltage on a component.
- We move the dial selector to the Voltage range of V~ sign of alternative current (AC). This setting is the same in all types of multi-meters. In the United States, the AC voltage range is 110-120 volts. While in many countries this range varies from 210-240 volts.
- Use the multi-meter accordingly. Suppose we need to check 240 volts, so we will move our dial selector to 300 volts maximum. If we move the dial to 240 or less, then we cannot get accuracy in our readings. To check the 240 Voltage/ AC Voltage, place the RED PROBE into the RED PORT of the multi-meter.
- Similarly, the BLACK PROBE goes into the BLACK PORT of the multi-meter. Now the other end (tail) of the RED PROBE goes into the first inlet of the plugin socket, or +ve wire of the socket which is a current wire of the circuit. Similarly, the other end of the BLACK PROBE goes into the second inlet of the plugin socket. Two heads of the probe in the multi-meter and the two tails of the multi-meter in the plug-in socket. The current circuit together with the multi-meter is completed.
- Now turn on the power switch of the multi-meter. The screen of the multi-meter gives you the reading of 220-240 volts, which means the current flow is perfect. Alternatively, if you need to check the 240 voltages in the current wire circuit, place the red lead to the (+ve) or current wire. Place the Black lead into the other (–ve) wire to complete the circuit.
How to check resistance with a multimeter
- The screen will show the reading of the voltage between 220-240 volts. In the United States, the AC voltage range is 110-120 volts. While in many countries this range varies from 210-240 volts. American 220 volts consists of 2 phases of 110 volt, and European 220 volt consists of single phase of 220 volts.
- In 120 volts, the transformers used can be more extensive and more expensive. Furthermore, due to the higher amperage supported for the lower voltage, stability is also highly needed.
- Another disadvantage of 120 volts is that the voltage tends to drop when your plug-in high-power consumption. The more consumers you have, the higher the voltage drop is. Considering the drop as a percentage from total voltage, it can affect other devices more in the 120 volts case than in a 230 volts home network. There are also a few advantages when using 120 V.
- First it is the more negligible risk of deadly electrocution. 120 V can be harmful, even it is considered safer than 220 V. An advantage of using 120 V is given by smaller voltage spikes transmitted in the network. For example, when we plug/unplug a device, sometimes, we zsee a flame. That thing is an electrical arch and sent in the network as a voltage spike.
How to check the dc voltage in a multimeter
- There are also devices such as computer power supplies and other devices that pollute the network with bad signals. For 120 V, they are smaller, conducting a minor interference between different devices using pulses to down-convert the voltage.
- We are going to use our multimeter to read out the typical dryer plug outlet. The test selectors are 30 amps 125 volts – 250 volts. The side of the plug is where your neutral wire would be. So, it is your neutral connection. This site is your ground, or your green wire would go, and there is a hot wire 120 volts would go to the right-side inlet, and on the other side 120 volts, and we are playing with 240 volts.
- Voltage playing is dangerous if you are unfamiliar with using a meter, work the safety precautions of electricity, and find professional assistance. We have red lead, and we place it in the bolt, the black lead plugged into the common port.
- We have turned our selector switch to the A/C volts. We are on the ground side, and we read one side of the outlet, and we got our 120 volts, and our measurement readings are 119.9 V. So now we are checking the other side, and we got 119.9 V, in our multimeter. Again, we are going to put our lead in the neutral hole on one side.
- we read 119.9 V, the other side of our multimeter is showing the reading of 119.9 V again, so far; everything on this is checking out precisely the way it is supposed to. We go from the hot inlet to the paired hot inlet, through my multimeter leads, each hot lead is 120 volts, so both the hot leads together 240 volts, and we have observed 239 volts measurements in our device. So, here we have learnt how to check 240 volts in a dryer plugin outlet.
- So far, everything we checked is good and perfectly done, do not forget your safety precautions while playing with the voltages. The question of 120 V or 240 V is determined by where you live. The government regulators and industry made a choice.
To deliver the same amount of power, you either need high voltage and low current or low voltage and high current. Electrical power transmission is usually by high voltage and low current. This saves on copper lines because they can be made thinner (The power loss to heat goes as resistance times current squared).
However, high voltage requires insulation and isolation since it creates large electric fields that can break down air and arc. Safety in the home requires lower voltage and insulation. Both 120 V and 240 V can penetrate through the resistance of your skin.