Question

calculate the electricity bill amount for a month of April if 4 bulbs of 40 watt for 5 hrs, 4 tube light for 60 watt for 5 hrs,a TV of 100 watt for 6 hrs are used per day the cost per unit is Rs1.80

Answer 1

0.04×4×5=0.8kwh 4×0.06×5=1.2kwh 0.6×1=0.6kwh 0.8+1.2+0.6=2.6kwh April has 30 days So, 2.6×30=78kwh Therefore for 1kwh=1.8₹ So, for 78kwh=78×1.8=140.4₹

Answer 2

Answer:

$\bf\underline{\underline{solution}}$

❥energy consume by bulb = power × time

= 40w watts × 5 hour

= 200watts

= 200 watts × 4 bulb

= 800 watts

= 0.8 unit

❥energy consume by tube light = power × time

= 60w × 5 hours

= 300watts

= 300 watts × 4 tube lights

= 1200 watts

= 1.2 unit

❥energy consume by T.V. = power × time

= 100w × 6 hours

= 600 watts

= 0.6 unit

❥energy consume by washing machine = power × time

= 400watts × 3 hour

= 1200 watts

= 1.2 units

➠sum of all units = 0.8+1.2+0.6+1.2 = 3.8 unit for a day

• for 30 days = 30× 3.8

= 114 units

now , each unit costs ₹4 per unit = ₹1.8× 114unit

= ₹ 205.2

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all done :P