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Ampere Meter

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AboZakaria

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Hi All
When We measure the current using Ampere Meter is the Displayed No =Ampere/Hour for example if the Ampere Meter Displayes 4A and The VoltMeter Displayes 5V (For DC Curcits) is that Mean That The load rated 20W/Hour ?
 
Hours have nothing to do with power dissipation nor current.

5V at 4A is a power dissipation of 20W. It could be for a micro-second or for months. The amp-meter measures current that is flowing now. The volt-meter measures voltage now. Multiply them and you have the amount of power that is dissipated now.

A rechargeable battery has an Ah rating which is how long the full charge can power a load until it is dead. Usually the current is 1/20th the rated current (they lie).
 
If your load were constant over time you could measure the current and voltage then calculate the watts. An example if you measured 10 volts and 5 amps you would have a load of 50 watts. If that 50 watts were continuous then you could say that 50 watt-hours would be consumed in an hours time.

If the current and voltage were not constant you would need a way to handle that. If you look at the relatively old mechanical watt-hour meters used by electric utilities you'll see they are quite complex.
 
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