Page 13 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

The potential at point A, V =118V
A
The potential at point B, V =128V
B
The work done, W= ?

We know that,

Potential difference,

∆V=V -V =128-118=10V
A
B
∴ Work done, W=∆V×q=10×2=20J

So, the work done in moving the charge is 20J.

Beginner’s box:

If a body has positive charge, then what does it
mean?

In which direction does the current flow in an
electric circuit?

The charge on an electron is 1.6 × 10 −19 . Find
the number of electrons that will flow per
second to constitute a current of 2A. (Ans. 1.25 ×
10 19 electrons)

Write a low resistance device name which is
always connected in series with the device
through which the current is to be measured.

If work done in moving a charge of 20mC from
infinity to a point O in an electric field is 15J, then
what is the electric potential at this point?

Write a high resistance device name which is
always connected in parallel.

Fig 6:

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