Given:

i = 0.2 A

v = 220 v

Numbers of lamps n = 10

working time 3 hrs/day

Explanation:

Total illumination times of 10 lamps in 30 days are

[tex]30 \times 3 \: hrs = 90hrs[/tex]

Power (P) = current (i) × voltage (v)

so,

[tex]p = iv = 0.2 \times 220 \: watt \\ = 44 \: watt[/tex]

if any electronic device's power is 44 wh ,it's mean that device consume 44 watt electric power in per

hours.

one hour consume electrical energy of one lapms is 44 watt, then 90 hrs consuming electrical energy for one lamps will be

[tex]44 \times 90 = 3960wh[/tex]

Thus 10 lamps consuming electrical energy in 30 days will

[tex]3960 \times 10 = 39600wh \\ = 3.96kwh[/tex]

Answer:

Option (A) is correct answer. (3.96 kwh)