If two D-cells are connected positive end to positive end, how much voltage would a voltmeter across the total array indicate? Give a reason for your response.
2007-04-24 10:50:15 · 4 answers · asked by Cutie 4 in Science & Mathematics ➔ Engineering
The voltmeter would read Zero volts. This assumes the batteries are identical D-cells, because you are measuring +1.5volts - 1.5 volts = 0 volts.
If one is brand new (1.5V) and the other one is used (1.2V), then the voltmeter will read some small voltage that is the difference between the two (like 0.3 volts or less).
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2007-04-24 11:07:22 · answer #1 · answered by tlbs101 7 · 2⤊ 0⤋
If the batteries are identical and at the same state of charge the volt meter will read zero. The voltages of items in series add, so you will have +1.5 + (-1.5)....One battery is backwards with respect to the other so they will cancel out.
In the real world there will be a small voltage, up to a few tenths of a volt either positive or negative. This is because the batteries won't be identical - one will be slightly more charged than the other or its internal composition a little bit different. The absolute value of the reading will tell you the difference between the batteries, and the sign will indicate which one is higher.
2007-04-24 19:51:41 · answer #2 · answered by Jared G 3 · 0⤊ 0⤋
The potential difference (voltage) between the 2 negative ends of the batteries. (see above answer for example)
2007-04-24 18:42:09 · answer #3 · answered by Tyson B 2 · 0⤊ 0⤋
If like this -(XXX)+ +(XXX)-
Then zero assuming both batteries are at the same voltage.
2007-04-24 17:53:43 · answer #4 · answered by Tom . 2 · 0⤊ 0⤋