Power consumption per day by 10 electric bulbs of power 60 watt, running 3 hours = P *N *T
= \(\frac{60}{1000}\times10\;\times3\)
= 1.8 UNIT
POWER consumed per month by these electric bulbs (P1) = 1.8 * 30 = 54 UNIT
Power consumed per day by fans of power 200 watt each running 6 hours = P* N *T
= \(\frac{200}{1000}\times5\;\times6\)
= 6 UNIT
Power consumed by fans per month by these fans is (P2) = 6 * 30 = 180 UNIT
Power consumed by the electric heater of power 1000 watt in every alternate day = P * N * T
= \(\frac{1000}{1000}\times1\;\times2\)
= 2 UNIT
Power consumed per month by the heater ( P3 ) = 2*15 days = 30 unit
The power consumed per week by the iron is = P*N*T
= \(\frac{750}{1000}\times1\;\times2\)
= 0.75 *2 = 1.5 UNIT
So the power consumed per month by the iron (P4) = 1.5 * 4 = 6 unit
Now total power consumed by all devices in one month is
= P1 + P2 +P3+ P4
= 54 + 180+30 +6 = 270 UNIT
The cost of electricity consumption = total power consumption * rate per unit = 270*10 = Rs 2700