Question

Please solve this question?

Answer 1

The equivalent voltage is `=4V`

Explanation:

The batteries are in series, but the third one is reversed

The voltage of each battery is `E=2V`

Therefore,

The voltage of the combination is

`E_c=3E- E=3*2-2=6-2=4V`

Answer 2

`=>4"V"`

Explanation:

There is `2 "V"` across each battery.

For combination circuits, you simply compute a weighted sum, where the directionality of each battery gives it a positive or negative value.

If we take left-to-right `(-) -> (+)` to be the positive configuration, then left-to-right `(+)->(-)` will be the negative configuration.

With the combination given, the first battery is `+2"V"`. The second battery is `+2"V"`. The third battery is `-2"V"`. The fourth battery is `+2"V"`.

Summing:

`2+2-2+2 = 6-2 = 4"V"`

Hence the equivalent potential difference is `4"V"`.