if 10 bulbs are lighted 4 hours every day for 60 days then the electricity bill is Rs.80. How many bulbs can be lighted for 3 hours every day for 16 days so that the electricity bill is rs. 40?
Answers
An electric bulb of 60W is lit for 10 hours a day, what is the amount to be paid in a month of 30 days, if one unit of electricity costs Rs. 3.50?
Given:-
Power= 60 Watt
Everyday Use = 10 Hours
Total Days= 30
Cost Of elctricity per unit= 3.50 Rs.
Find:-
Total amount to be paid in 30 days
Given:-
The days can be calculated in total hours used in 30 days
Hence, Days x Everyday Use = 30 x 10 = 300 Hours
Convert, 60 Watt into Kwatt = 60/1000
By Formula,
Unit= Kwatt x Time (in hours)
U= 60/1000 x 300
U= 18
Hence, total unit used is 18.
By Formula,
Cost= Unit x Rupees per unit
Cost= 18 x 3.50
Cost= 63 Rupees
Answer:
Step-by-step explanation:
Energy = Power time
Energy consumed by 100 W bulb per day
= 2 × 100 Wh
= 0.2 KWh
Energy consumed by 40 W bulbs per day
= 4 × 40 × 4 Wh
= 0.64 kWh
Total energy consumed per day
= 0.2 + 0.64 KWh
= 0.84 KWh
Therefore, the energy consumed in 30 days = 30 × 0.84 kWh
= 25.2 KWh