Home
Class 10
PHYSICS
A 2 kW heater, a 200 WTV and three 100W ...

A 2 kW heater, a 200 WTV and three 100W lamps are all switched on from 6 p.m. to 10 p.m. What is the total cost at Rs. 5.50 per kWh?

Text Solution

Verified by Experts

The correct Answer is:
Rs. 55.00
Promotional Banner

Topper's Solved these Questions

  • ELECTRICITY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Very Short Answer Type Questions|1 Videos

  • ELECTRICITY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Short Answer Type Questions|2 Videos

  • ELECTRICITY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Sample Problem|1 Videos

  • MAGNETIC EFFECT OF ELECTRIC CURRENT

    LAKHMIR SINGH & MANJIT KAUR|Exercise NCERT BOOK|2 Videos

Similar Questions

Explore conceptually related problems

What is the cost of 27.5 m of cloth at Rs 53.50 per metre?

The sides of a triangular field are 140 m. 225m and 265 m . What is the cost of levelling it at Rs. 5.50 per m^(2) ?

A farmer wants to fence his rectangular field of length 200 m and area 3000 m^2 . If the cost of fencing per metre is 5 rupees, what is the total cost of fencing in rupees?

The diagonal of a rectangle field is 15 m and its area is 108 m^2 . What is the cost of fencing the field at ₹50.50 per m?

A farmer wants to fence his rectangular field of length 200 m and area 3000 m^2 . If the cost of fencing per metre is 5 rupees, wha is the total cost of fencing in ruppes?

An 1800 W toaster, a 1.3 kW electric fan and a 100 W lamp are plugged in the same 120 V circuit i.e., all the three devices are in parallel. What is the approximate value of the total current (i.e. the sum of current drawn by the three devices) through the circuit ?

A metal block is placed in a room which is at 10^(@)C . It is heated by an electric heater of power 500 W till its temperature becomes 50^(@)C . Its initial rate of rise of temperature is 2.5^(@)C//sec . The heater is switched off and now a heater of 100 W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) (i) What is the heat capacity of the block ? ( ii ) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off ? (iii) What is the heat radiated per second when the block was 30^(@)C ?

A rectangular playground is 35 m long and 15 m broad. Find the cost of fencing it at Rs. 2.50 per metre.

The sides of a triangular field are 56 m, 90 m and 106 m. The cost of levelling the field at Rs 6.80 per m^(2) is :

LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Two lamps, one rated 40W at 220V and the other 60W at 220 V, are conne...

    Text Solution

    |

  2. An electric kettle connected to the 230V mains supply draws a current ...

    Text Solution

    |

  3. A 2 kW heater, a 200 WTV and three 100W lamps are all switched on from...

    Text Solution

    |

  4. What is the maximum power in kilowatts of the appliance that can be co...

    Text Solution

    |

  5. An electric fan runs from the 230V mains. The current flowing through ...

    Text Solution

    |

  6. (a) What is meant by "electric power"? Write the formula for electric ...

    Text Solution

    |

  7. When an electric lamp is connected to 12V battery, it draws a current ...

    Text Solution

    |

  8. The unit for expressing electric power is:

    Text Solution

    |

  9. Which of the following is likely to be the correct wattage for an elec...

    Text Solution

    |

  10. An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per ...

    Text Solution

    |

  11. Unit of energy is SI system is

    Text Solution

    |

  12. Commercial Unit Of Energy

    Text Solution

    |

  13. How much energy does a 100W electric bulb transfer in 1 minute?

    Text Solution

    |

  14. An electric kettle for use on a 230V supply is rated at 300 W. for saf...

    Text Solution

    |

  15. How many joules of electrical energy are transferred per second by a 6...

    Text Solution

    |

  16. At a given time, a house is supplied with 100A at 220V. How many 75W, ...

    Text Solution

    |

  17. If the potential difference between the ends of a fixed resistor is ha...

    Text Solution

    |

  18. State whether an electric heater will consume more electrical energy o...

    Text Solution

    |

  19. The table below shows the current in three different electrical applia...

    Text Solution

    |

  20. A boy noted the readings on his home's electricity meter on Sunday at ...

    Text Solution

    |