Home
Class 12
PHYSICS
How much time heater will take to incre...

How much time heater will take to increase the temperature of 100g water by `50^(@)C` if resistance of heating coat is `484Omega` and supply voltage is 220V a.c.

Text Solution

Verified by Experts

Heat given heater=heat taken by water
`rArr (V^(2))/(R)t=ms Jdeltatheta`
`rArr(220xx220)/(484)t=(100xx10^(-3))(4.2xx10 ^(3))(50)`
`rArr t=210` sec
Promotional Banner

Topper's Solved these Questions

  • CIRCULAR MOTION

    ALLEN|Exercise EXERCISE (J-A)|6 Videos

  • GEOMETRICAL OPTICS

    ALLEN|Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

What is the required resistance of the heater coil of an immersion heater that will increase the temperature of 1.50 kg of water from 10^(@)C to 50^(@)C in 10 minutes while operating at 240V ?

The heater coil of an elecric kettle is rated at 2000W,200V, How much time will in take is rasing the temperature of 1 litres of water from 20^(@)C to 100^(@)C . Assuming that only 80% of the total heat energy produced by the heater coil is used in raising the temperature of water. Density of water heater coil is used in raising the temperture of water. density of water = 1g cm^(-3) and specific heat of water = 1 "cal" g^(-1) .^(@)C^(-1) .

The heater coil of an elecric kettle is rated at 2000W,200V, How much time will in take is rasing the temperature of 1 litres of water from 20^(@)C to 100^(@)C . Assuming that only 80% of the total heat energy produced by the heater coil is used in raising the temperature of water. Density of water heater coil is used in raising the temperture of water. density of water = 1g cm^(-3) and specific heat of water = 1 "cal" g^(-1) .^(@)C^(-1) .

A vessel containing 100 g ice at 0^(@)C is suspended in a room where temperature is 35^(@)C . It was found that the entire ice melted in 10 hour. Now the same vessel containing 100 g of water at 0^(@)C is suspended in the same room. How much time will it take for the temperature of water to rise to 0.5^(@)C . Neglect the heat capacity of the vessel. Specific heat of water and specific latent heat of fusion of ice are 1 cal g^(-1) .^(@)C^(-1) and 80 cal g^(-1) respectively.

How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater is 100Omega ?

A metal block is placed in a room which is at 10^(@)C for long time. Now 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 100W is required to maintain the temperature of the block at 50^(@)C . (Assume Newtons Law of cooling to be valid) What is the rate of cooling of block at 50^(@)C if the 100W heater is also switched off?

One heater coil takes time t_1 to heat a glass of water and another takes time t_2 to heat the same amount of water. How much time will it take to heat the same amount of water when the two are connected in series and when the two are connected in parallel ? voltage applied is same in all cases.

How much current does an electric heater draw from a 220 V line, If the resistance of the heater (when hot) is 50 Omega ?

How much heat should be supplied to convert ice of mass 50 g at 0^@C into water at 40^@ C ?

ALLEN-CURRENT ELECTRICITY-All Questions
  1. Two electric bulbs whose resistances are in the ratio of 1:2 are conne...

    Text Solution

    |

  2. A cell sends a current through a resistance R(1) for time t, next the...

    Text Solution

    |

  3. How much time heater will take to increase the temperature of 100g wa...

    Text Solution

    |

  4. A steady current of 10.0 A is maintained in a copper voltameter . Calc...

    Text Solution

    |

  5. A copper voltameter is connected in series with a coil of resistance 1...

    Text Solution

    |

  6. In a copper voltmeter, mass deposite in 30 seconds is 'm' gram. If the...

    Text Solution

    |

  7. The emf varepsilon of a Cu-Fe thermocouple varies with the temperature...

    Text Solution

    |

  8. Near room t emperature, the thermo emf of a copper constantan couple i...

    Text Solution

    |

  9. For a copper-iron and a chromel-alumel thermocouple, the plots betwee...

    Text Solution

    |

  10. Four resistances carrying a current shown in Fig. 7.41 are immersed in...

    Text Solution

    |

  11. Radha's house is fitted with 2 lamps of 60W each and 2 fans consuming ...

    Text Solution

    |

  12. Two 120 V light bulbs, one of 25 W other of 200 W were connected in se...

    Text Solution

    |

  13. How much time heater will take to increase the temperature of 100g wa...

    Text Solution

    |

  14. If a bulb rated as (25W-220V) is connected in series to another bulb r...

    Text Solution

    |

  15. A heater takes 50 minute to boil a given amount of water, its coil is ...

    Text Solution

    |

  16. There are two separate coils in a heater . If one col is used then it ...

    Text Solution

    |

  17. In given circuit initially switch S(w(1)) is closed and S(w(2)) is ope...

    Text Solution

    |

  18. A dry cell of emf 1.5V and internal resistance 0.10 Omega is connecte...

    Text Solution

    |

  19. A thermocouple produces a thermo emf of 40muV//.^(@)C. A thermopile i...

    Text Solution

    |

  20. The thermo emf of a thermocouple is given by E=alpha(theta-theta(g))+b...

    Text Solution

    |