What is Electric Current
We know that the charge of an electron is 1.6 × 10–19 coulomb (or 1.6 × 10–19 C).
Now, If charge is 1.6 × 10–19 C, No. of electrons = 1
If charge is 1 C, then No. of electrons=
We are given, I = 0.5 A; t = 10 min = 600 s.
we have
Q = It
= 0.5 A × 600 s = 300 C
Thus, the amount of work W, done in moving the charge is
W = VQ
= 12 V × 2 C= 24 J.
We know that :
Potential difference =Work done/ Charge moved
or V =W/Q
Here, Potential difference, V = 128 – 118 = 10 volts
Work done, W = ? (To be calculated)
And, Charge moved, Q = 2 coulombs
Putting these values in the above formula, we get : 10 =W/2 or W = 10 × 2
Thus, Work done, W = 20 joules