230 V

yes, electronic ac voltmeters can be designed to read either the average value or the rms value. When you use a voltmeter to measure AC voltage the voltmeter reading shows the rms value of the voltage.

Yes normally we use 230v AC that is RMS value and its maximum value is 230xsqrt2.

In AC voltage the current voltage is constantly changing with time. Trying to state a specific voltage at a current point in time would be like stating the time of day to the second - by the time you speak the words, the time has already passed.

Sometimes AC voltage is given as peak value. For a typical 110v system peak voltage is around 170v, which sounds good, but the voltage will only be 170 for a split second at a time, so if you were to hook a 170v device up to it then the device would not operate properly. Plus, peak voltage cannot be used to accurately calculate the amount of work that you can do in a given amount of time (output power), so we use RMS voltage which represents what level the voltage acts like over a period of time if you averaged out the varying voltage level of each individual arc in the AC sine wave.

Here's a link that shows some good illustrations:

http://www.bcae1.com/voltages.htm

The RMS is equvivlent DC voltage to the Analogous AC voltage so multimeter(volT)

reads equivalent AC in DC.

Hi,

Think on what's AC means... 50Hz, 60Hz.... The only alternative to show the RMS value is to show the instantaneous value (any data acquisition equipment can give it you).

The problem is the response time of the instrument. If you try to see the instantaneous value, it will change from ± peak value frequency times so you Will have not a readable more or less static value. You will see a succession of figures between + peak and - peak. Some multimeters have the "peak" function so you see the RMS value and also the peak value. Ratio between both is RMS = Peak/√2 or Peak times 0.7071.

Some multimeters measure the average positive voltage of a wave form and scale the values using the square root of two readings to produce a display. Also there are true RMS multimeters but they are usually costly to afford. In all it is ok assumed that all multimeters are calibrated to read RMS values.

RMS or Effective values of alternating currents is numerically equal to the direct current that would produce the same amount of heat in a given resistance during one period T of the alternating current as it is actually developed by the latter in that time.

One point we should note is that the DC values are more effective values than their corresponding AC values, meaning the DC current develops a greater amount of heat in the given resistance and time than the alternating current does since the value of the latter remains below that of the direct current, except for the instance when peak values are attained.

One should also be very conscious when taking reading with undefined meters as to know when to apply 0.707 to arrive at the RMS value.

Dickson.

IN THIS QUESTION, IF IT WERE 230 VOLT 3 PHASE AC SYSTEM IN PLACE OF ONE PHASE?

I'll bite...where can I get a three-phase voltmeter please? With three leads? Four?....