Home
Class 10
PHYSICS
An electric heater of resistance 8 ohm d...

An electric heater of resistance 8 ohm draws 15A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater.

Text Solution

Verified by Experts

Here, 1= 15 A, `R = 8 Omega, t = 2h`
The rate at which heat is developed in the heater means its electric power,
`P =I^2R`
`=(15)^2 xx 8 =225 xx8 1800 W =1800 J/s`
Promotional Banner

Topper's Solved these Questions

  • ELECTRICITY

    KUMAR PRAKASHAN|Exercise ADDITIONAL QUESTION AND ANSWERS (Solve the following examples:)|23 Videos

  • ELECTRICITY

    KUMAR PRAKASHAN|Exercise ADDITIONAL QUESTION AND ANSWERS (State at least three points of difference between the following terms / quantities: )|2 Videos

  • ELECTRICITY

    KUMAR PRAKASHAN|Exercise QUESTIONS AND ANSWERS (MORE TO KNOW)|1 Videos

  • MAGNETIC EFFECTS OF ELECTRIC CURRENT

    KUMAR PRAKASHAN|Exercise VALUE BASED QUESTIONS WITH ANSWERS|15 Videos

Similar Questions

Explore conceptually related problems

An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s.

An electric dipole is prepared by taking two electric charges of 2 xx 10^(-8) C separated by distance 2 mm. This dipole is kept near a line charge distribution having density 4 xx 10^(-4) C/m in such a way that the negative electric charge of the dipole is at a distance 2 cm from the wire as shown in the figure. Calculate the force acting on the dipole. [Take k=1/(4piepsilon_(0)) = 9 xx 10^(9) Nm^(2)C^(-2) ]

An electric heater consumes 4.4 kW power when connected with a 220V line voltage. Calculate the resistance of the heater.

An electric heater is rated 1500 W. How much energy does it use in 10 hour?

The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw, if the potential difference is increased to 120V ?

An ideal monoatomic gas is confined in a cylinder by a spring-loaded piston of cross-section 8.0xx10^-3m^2 . Initially the gas is at 300K and occupies a volume of 2.4xx10^-3m^3 and the spring is in its relaxed (unstretched, unompressed) state, fig. The gas is heated by a small electric heater until the piston moves out slowly by 0.1m. Calculate the final temperature of the gas and the heat supplied (in joules) by the heater. The force constant of the spring is 8000 N//m , atmospheric pressure is 1.0xx10^5 Nm^-2 . The cylinder and the piston are thermally insulated. The piston is massless and there is no friction between the piston and the cylinder. Neglect heat loss through lead wires of the heater. The heat capacity of the heater coil is negligible. Assume the spring to be massless.

Two moles of an ideal monoatomic gas are confined within a cylinder by a massless and frictionless spring loaded piston of cross-sectional area 4 xx 10^(-3)m^(2) . The spring is, initially in its relaxed state. Now the gas is heated by an electric heater, placed inside the cylinder, for some time. During this time, the gas expands and does 50J of work in moving the piston through a distance 0.10m . The temperature of the gas increases by 50K . Calculate the heat supplied by the heater. P_(atm) = 1 xx 10^(5)N//m^(2)R = 8.314 J//mol-K

The maximum electric field at a distance of 10m from an isotropic point source of light is 3.0 Vm^(-1) . Calculate (a) the maximum value of magnetic field, (b) average intensity of light at that place and (c ) the power of the source. [c=3xx10^(8)ms^(-1), epsilon_(0)=8.854xx10^(-12)C^(2)N^(-1)m^(-2)]

An electric heater consumes 4.4 kW power when connected with a 220V line voltage. Calculate the energy consumed in 2hours.

KUMAR PRAKASHAN-ELECTRICITY-TEXTUAL EXERCISE
  1. Two conducting wires of the same material and of equal lengths and eq...

    Text Solution

    |

  2. How is a voltmeter connected in the circuit to measure the potential d...

    Text Solution

    |

  3. A copper wire has diameter 0.5 mm and resistivity of 1.6 xx 10^(-6) Om...

    Text Solution

    |

  4. The values of current I flowing in for the corresponding values of pot...

    Text Solution

    |

  5. When a 12V battery is connected across an unknown resistor, there is a...

    Text Solution

    |

  6. A battery of 9 V is connected in series with resistors of 0.2 Omega, ...

    Text Solution

    |

  7. How many 176 'Omega' resistors (in parallel) are required to carry 5...

    Text Solution

    |

  8. Show how you would connect three resistors, each of resistance 6 Omega...

    Text Solution

    |

  9. Several electric bulbs designed to be used on a 220V electric supply l...

    Text Solution

    |

  10. A hot plate of an electric oven connected to a 220V line has two resis...

    Text Solution

    |

  11. Compare the power used in the 2Omega resistor in each of the following...

    Text Solution

    |

  12. Compare the power used in the 2Omega resistor in each of the following...

    Text Solution

    |

  13. Two lamps, one rated 100W at 220 V, and the other 60 W at 220 V are co...

    Text Solution

    |

  14. Which uses more energy, a 250W TV set in 1 h, or a 1200W toaster in 10...

    Text Solution

    |

  15. An electric heater of resistance 8 ohm draws 15A from the service main...

    Text Solution

    |

  16. Why is the tungsten used almost exclusively for filament of electric ...

    Text Solution

    |

  17. Why are the conductors of electric heating devices, such as bread-toas...

    Text Solution

    |

  18. Why is the series arrangement not used for domestic circuits? Explain...

    Text Solution

    |

  19. How does the resistance of a wire vary with its area of cross-section?...

    Text Solution

    |

  20. Why are copper and aluminium wires usually employed for electricity tr...

    Text Solution

    |