how many units of energy are consumed if one uses 10 litres of petrol? about 13 units about 33 units about 130 units about 330 units
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How much units of energy is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
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Question
How much units of energy is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
A100 kwh
B150 kwh
C160 kwh
D500 kwh
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Updated on : 2022-09-05
Solution Verified by Toppr
Correct option is B)
Given : P=0.05 kW t=10 hours per day
Number of bulbs n=10
Energy consumed per day E=nPt=10×0.05×10=5 kwh per day
Total energy consumed in 30 days E
t =5×30=150 kWh
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How much energy is released by burning 1 litre of petrol?
Answer (1 of 7): The calorific value of petrol is about 46 MJ/kg Density of petrol is about 0.75 kg/ l Therefore the energy content of one litre of petrol is around 0.75*46 = 34.5 MJ which can be achieved by burning one litre of petrol. .
How much energy is released by burning 1 litre of petrol?
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BE(Hons.), Electrical from Birla Institute of Technology and Science, Pilani - Pilani Campus (Graduated 1970)Author has 666 answers and 2M answer views5y
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How much energy is formed by burning 1 litre of petrol?
The calorific value of petrol is about 46 MJ/kg
Density of petrol is about 0.75 kg/ l
Therefore the energy content of one litre of petrol is around 0.75*46 = 34.5 MJ which can be achieved by burning one litre of petrol. .
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Density of Petrol = 0.7489 - g/ ml
So weight of 1- Litre of petrol = 748.9 g
Energy released by burning 1- g of petrol = 44- 48- KJ.
Energy released by burning 1- Litre or 748.9 g of petrol~=750- g
~= 750 x 44 (48)
= 33000 KJ to 36000 KJ
James M. Volo
Physics Professor PhD (1969–present)Author has 14.8K answers and 36.3M answer viewsNov 27
About 32 MJ/liter for 87 Octane. Most motor fuels designated as petrol or gasoline (not Diesel) are within 10% +/- of this number.
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What is a commercial unit of energy? How many units of energy are consumed when an electric iron of power rating 450 W is used for 8 hours?
What is a commercial unit of energy? How many units of energy are consumed when an electric iron of power rating 450 W is used for 8 hours?
Byju's Answer Standard XII Physics
Average and Instaneous Power
What is a com... Question
What is a commercial unit of energy? How many units of energy are consumed when an electric iron of power rating 450 W is used for 8 hours?
Open in App Solution
Energy: It is nothing but the capability or capacity to work.An object having the capability to do work is said to possess energy.
SI unit of energy is the joule second-1 or watt.
Joule second-1 or watt is a small unit and it's not practical to use a small unit when we are dealing with large energy consumption.
Therefore the commercial unit of energy is kWh or kilowatt-hour (1kWh=1unit).
Step 1:Given the power rating of the electric iron (P)= 450 W.Time for which the electric iron is used (t) = 8 hours
Let E is the total energy used by the electric iron.
Step 2: Power is defined as the rate of transfer of energy.Power(P)=Energy supplied (E)Time(t)
Step 3: Substituting the value of P and t in the formula we get-450W=E8hour or E=450watt×8hour or E=3600 watt-hour
or E=3600 watt-hour1000 (1kW=1000W)
or E=3.6kWh
or 3.6 Units (since 1kWh=1unit)
Hence 3.6 units will be consumed by the electric iron of power rating 450 W is used for 8 hours.
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SIMILAR QUESTIONS
Q. Assertion :Kilowatt Hour is the unit of electric power Reason: KWH is a commercial unit used for expressing consumed electrical energy.Q. what is the commercial unit of electricity consumed? how it is related to si unit of energy? a geyser of 2.5kw is used for 6 hours daily. calculate the cost of electricity consumed in 10 days if the rate per unit is Rs.4?Q. A bulb of power 400 W works for 8 hours daily. Calculate the total units of commercial electrical energyconsumed in 15 days.
Q.In a factory, 5 electric bulbs of power 500W are used for 6 hours and a heater of 2kW is uesd for 8 hours in day. Calculate the energy consumed in 30 days and the cost of the electrical energy @ Rs. 5/unit.
Q.five bulbs each having 100W power are used for 4 hours, a heater having 1500W is used for 2 hours, and an electric iron of power 1000W is used 5 hours.
a) calculate the total energy consumed by them.
b) convert the energy into joules
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