Home
Class 11
PHYSICS
Calculate the energy consumed in electri...

Calculate the energy consumed in electrical units when a 75 W fan is used for 8 hours daily for one month (30 days)

Text Solution

Verified by Experts

Power, `p=100W`
Time of usage, `t=8hourxx30days=240hours`
Electrial energy consned is the product of power and time of usage.
`"Electrical energy "=power xx "time of usage"=p xx t`
`=75 "watt"xx240 "hou"r=18000" watt hour"= 18" kilowatt hour"=18kwh`
`1 "electrical unit"=1 kWh`
`"Electrial energy"=18 unit`
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    FULL MARKS|Exercise Textual Questions Solved (I. Multiple Choice Question:)|15 Videos

  • WORK, ENERGY AND POWER

    FULL MARKS|Exercise Textual Questions Solved (II. Short Answer Questions)|5 Videos

  • WAVES

    FULL MARKS|Exercise Additional Questions Solved (Numerical Problems )|10 Videos

Similar Questions

Explore conceptually related problems

(i) A torch bulb is rated at 3V and 600 mA. Calculate, (a) power (b) resistance (c ) energy consumed if it is used for 4 hours. (ii) Calculate the mass of a body weighing 100 dyne. g=10m//s^(2) .

(i) A torch bulb is rated at 3V and 600 ma . Calculate it's (a) power (b) resistance (c) energy consumed if it used for 4 hours. (ii) Why does sound travel faster on a rainy day than on a dry day ?

A town has a population of 1 million. The average electric power needed per person is 300W. A reactor is to be designed to supply power to this town. The efficiency with which thermal power is converted into electric power is aimed at 25%.(a) Assuming 200 MeV of thermal energy to come form each fission event on an average, find the number of events on an place every day. (b) Assuming the fission to take place largely through U^235 , at what rate will the amount of U^235 decrease ? Express uour answer in kg per day. (c) Assuming that uranium enriched to 3% in U^235 will be used, how much uranium is needed per month (30 days)?

One unit of electrical energy consumed is equal to 1000 kilowatt hour.

Which unit is used to measure electrical energy ? (or) Define kilo watt hour.

Water falling from a 50 m high fall is to be used for generating electric enegy. If 1.8xx10^5kg of water falls per hour and half the gravitational potential energyh can be converted into electric energy, how many 100 W lamps can be it?

In the determination of internal resistance of a cell of e.in.f. 1.5 V with potentiometer, the balancing length is 75 cm in the open circuit and when a resistance of 10 Omega is used the balancing length is found to be 65 cm. Calculate the internal resistance of the cell.