# 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)

**A**

## 100 kwh

**B**

## 150 kwh

**C**

## 160 kwh

**D**

## 500 kwh

Easy Open in App

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

Related

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 energy

consumed 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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