हिंदी

How Many Joules Are There in One Kilowatt-hour?

Advertisements
Advertisements

प्रश्न

 How many joules are there in one kilowatt-hour?

Advertisements

उत्तर

  1 kilowatt-hour = 36,00,000 joules

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Electricity - Exercise 7

APPEARS IN

लखमीर सिंग Physics [English] Class 10
अध्याय 4 Electricity
Exercise 7 | Q 29.3

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

Write the formula for electric power in terms of potential difference and current.


Define kilowatt-hour. 


Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.


How many joules of electrical energy are transferred per second by a 6 V; 0.5 A lamp? 

(a) 30 J/s
(b) 12 J/s
(c) 0.83 J/s
(d) 3 J/s


1kWh = …….. J


List the names of three electrical gadgets used in your house. Write their power, voltage ratingand approximate time for which each one is used in a day. Hence find the electrical energyconsumed by each in a day.


An immersion heater rated 1000 W, 220 V is used to heat 0.01 m3 of water. Assuming that the power is supplied at 220 V and 60% of the power supplied is used to heat the water, how long will it take to increase the temperature of the water from 15°C to 40°C?


A dynamo converts one from of energy into another. Name the two forms of energy.

Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?


Point out two main disadvantages of ‘Tree System’.


Name three main characteristics of an heating element.


Household wiring for lamp connections can either be done in parallel or in series.Which one would you prefer? Give a reason for your answer.


Why is the heating element of an electric oven wound on a helix? State the reason.


Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.


An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?


What is the resistance of an appliance rated at V volt, P watt?


A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?


An electric iron is rated at 230 V, 750 W. What is its resistance? What maximum current can be passed through it?


Two heaters A and B have power rating of 1 kW and 2 kW, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is ______


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×