What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal?

Answer: Option D

The correct answer is D: 20 joules
Here's why:
Energy used by a battery is related to the charge it moves and the voltage across it.
The formula we need to use is: Energy (E) = Charge (Q) x Voltage (V)
We are given the voltage (V) as 20 V.
We need to find the charge (Q).
We know the number of electrons (6.28 x 10¹⁸).
The charge of a single electron is approximately 1.6 x 10^-19 Coulombs.
To find the total charge (Q), we multiply the number of electrons by the charge of a single electron:
Q = (6.28 x 10¹⁸) x (1.6 x 10^-19) Coulombs
Q ≈ 1 Coulomb
Now we can calculate the energy:
E = Q x V
E = 1 Coulomb x 20 V
E = 20 Joules
Therefore, the energy used by the battery is 20 joules.