Watt Hour Vs. Amp Hour | Sciencing
In an ideal battery, this relationship between continuous current and discharge time is Therefore, we must take the amp-hour relationship as being an ideal battery, this may mean a resistor with a power rating of several hundred watts. G'day folks, lets see if we can make these muddy waters a little less muddy. So let's start with finding out what the difference is between Amps, and Amp-hours!. Amp-hours measure a battery's electrical storage capacity, assuming its voltage stays What Is the Relationship Between Amps & AH?.
Amp Hours vs Kilowatt Hours
We could use the unit of the coulomb equal to 6. Since 1 amp is actually a flow rate of 1 coulomb of electrons per second, and there are seconds in an hour, we can state a direct proportion between coulombs and amp-hours: Why make up a new unit when an old would have done just fine?Amp Hours??? Battery Capacity Explained
To make your lives as students and technicians more difficult, of course! Therefore, when amp-hour capacity is given for a battery, it is specified at either a given current, given time, or assumed to be rated for a time period of 8 hours if no limiting factor is given.
For example, an average automotive battery might have a capacity of about 70 amp-hours, specified at a current of 3. This means that the amount of time this battery could continuously supply a current of 3.
With higher currents, the battery will dissipate more heat across its internal resistance, which has the effect of altering the chemical reactions taking place within.
Difference between amp hours and watt hours | All About Lead Acid Batteries
Chances are, the battery would fully discharge some time before the calculated time of 1 hour under this greater load. Therefore, we must take the amp-hour relationship as being an ideal approximation of battery life, the amp-hour rating trusted only near the specified current or timespan given by the manufacturer. For secondary cells, the amp-hour rating provides a rule for necessary charging time at any given level of charge current.
Approximate amp-hour capacities of some common batteries are given here: The most deceptive change that a discharging battery exhibits is increased resistance.
What this phenomenon describes is the fact that any increase in the current draw on the battery will also result in a decrease on capacity. Similarly decreasing the current draw will result in an increase in battery capacity. More, the relationship is not linear. From a practical perspective, this means the Kilowatt Hour rating is difficult to extrapolate when value as the current draw increases.
Kilowatt Hours and Series Batteries Systems. In some systems, 12 volt batteries will be connected in series end to end to created a higher voltage. For example, two 12 volt batteries in series will provide 24 Volts. Suppose two 12 volt batteries rated at Amp Hours were connected in series.
While the voltage would increase to 24 Volts, the Amp Hours would remain the same. While amp hours remain the same, voltage does not. That means the power capacity has increased.
- Ampere hour
- How to calculate battery run-time
In the case of our Amp Hour series batteries, the Watt Hours have increased to watts. This particular characteristic can be a contributor to choosing 24 Volt Systems.
Wire size selection is largely based on the current that the wire must carry. The more current, the larger the wire.