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what is the reason for potential drop across resistor??
plz explain in terms of electrons!!!!

There is an arrangement of three charges.
There is one with 5.0 C at the origin of some axis of coordinates. The second charge of -4.0 C, is located in the coordinate (20 cm,30 cm) and the third charge, of 3.0 C, is located at the point (25 cm,-50 cm). calculate: a. electric potential at (30 cm,
0) b. electric field at (30 cm,0) c. the potential energy of the arrangement d. the work needed to bring one particle of 1.5 C from the infinite to the point (30 cm, 0)

Consider the equipotential surfaces shown in the figure below. In this region of space, what is the approximate direction of the electric field?

An electron moving parallel to the x axis has an initial speed of 4.58 106 m/s at the origin. Its speed is reduced to 1.06 105 m/s at the point x = 2.00 cm.
(a) Calculate the electric potential difference between the origin and that point in volts
(b) Which point is at the higher potential?
the point x = 2.00 cm
both have the same potential?
or the origin?

Rank the electric potential energies of the systems of charges shown in the figure below from largest to smallest. Indicate equalities if appropriate. (Use only > or = symbols. Do not include any parentheses around the letters or symbols.)

(a) Calculate the electric potential 0.340 cm from an electron in Volts
(b) What is the electric potential difference between two points that are 0.340 cm and 0.840 cm from an electron? In Volts
(c) How would the answers change if the electron were replaced with a proton?

The two charges in the figure below are separated by a distance d = 1.50 cm, and Q = +5.60 nC.
(a) Find the electric potential at A. (in kV)
(b) Find the electric potential at B. (in kV)
(c) Find the electric potential difference between B and A.

A uniform electric field of magnitude 310 V/m is directed in the negative y direction as shown in the figure below. The coordinates of point are (-0.750, -0.900) m, and those of point are (0.500, 0.450) m. Calculate the electric potential difference VB VA using the dashed-line path.

The electric potential inside a charged spherical conductor of radius R is given by V = keQ/R, and the potential outside is given by V = keQ/r. Using Er = -dV/dr, derive the electric field inside and outside this charge distribution. (Use any variable or symbol stated above as necessary.
(a) inside, E=?
(b) outside, E=?

Consider a ring of radius R with the total charge Q spread uniformly over its perimeter. What is the potential difference between the point at the center of the ring and a point on its axis a distance 4R from the center? (Use any variable or symbol stated above along with the following as necessary: ke.)
V = V4R V0 = ?