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How long does the torch rund before it runs out, and how do i calculate that?
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It depends on what sort of batteries it has. Batteries are measured in Ah (amp hours). This means, how many amps it can provide in an hour. Say, if a flashlight (or torch) is drawing an amp of current, and the battery has 3Ah power, it can draw 1 amp of current for about 3 hours.However, flashlights tend to draw significantly less power. You would need to know how much current the light is drawing. Then you would calculate that against how many amp hours the battery has by dividing the current being drawn into the total Ah rating (for example 5Ah / 0.5A = 5 hours run time).You can figure out how much current is being drawn by any light using a multimeter. To learn how to do this, check out the electricity lesson in the Electronics Class.
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