Home
Class 10
PHYSICS
What is the role of fuse, used in series...

What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Text Solution

Verified by Experts

Fuse is a safety device which is used to limit the current in an electric circuit.
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

What is the purpose of using a fuse in an electrical circuit?

How does use of a fuse-wire protect electrical appliances ?

What is the pole fuse ? Write down its current rating.

'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?

A fuse is rated 8 A. Can it be used with an electrical appliance rated 5 kW, 200 V ? Give a reason.

Electric fuse is a protective device used in series with an electric circuit or an electric appliance to save it from damage due to overheating porduced by strong current in the circuit or application. Fuse wire is generally made from an alloy of lead and tin, which has hifh resistance and low melting point. It is connected in series in an electric installation. If a circuit gets accidentally short-circuited, a large current flows, then fuse wire melts away, which causes a break in the circuit. The power through fuse (F') is equal to heat energy lost per unit area per unit time (h) (neglecting heat loses from ends of the wire). P = I^2R = h xx 2pirl [R = (rhol)/(pir^2)] where r and l are the length and radius of fuse wire, respectively. A Battery is described by its emf (E) and internal resistance (r). Efficiency of battery (eta) is defined as the ratio of the output to the input power. eta = (Output power)/(Input power) xx 100% But I= E//(R+r), input power = EI. Output power = EI - I^2r , then. eta = ((EI - I^2r)/(EI)) xx 100 = (1-(Ir)/E) xx 100 =[1 - (E/(R+r)) (r/E)] xx 100 = (R/(R+r)) xx 100 We know that output power of a source is maximum when the external resistance is equal to internal resistance, i.e., R = r . The maximum power rating of a 20.0 Omega fuse wire is 2.0 kW. This fuse wire can be connected safely to a DC source (negligible internal resistance) of

Electric fuse is a protective device used in series with an electric circuit or an electric appliance to save it from damage due to overheating porduced by strong current in the circuit or application. Fuse wire is generally made from an alloy of lead and tin, which has hifh resistance and low melting point. It is connected in series in an electric installation. If a circuit gets accidentally short-circuited, a large current flows, then fuse wire melts away, which causes a break in the circuit. The power through fuse (F') is equal to heat energy lost per unit area per unit time (h) (neglecting heat loses from ends of the wire). P = I^2R = h xx 2pirl [R = (rhol)/(pir^2)] where r and l are the length and radius of fuse wire, respectively. A Battery is described by its emf (E) and internal resistance (r). Efficiency of battery (eta) is defined as the ratio of the output to the input power. eta = (Output power)/(Input power) xx 100% But I= E//(R+r), input power = EI. Output power = EI - I^2r , then. eta = ((EI - I^2r)/(EI)) xx 100 = (1-(Ir)/E) xx 100 =[1 - (E/(R+r)) (r/E)] xx 100 = (R/(R+r)) xx 100 We know that output power of a source is maximum when the external resistance is equal to internal resistance, i.e., R = r . Two fuse wires of same potential , material have length ratio 1:2 and ratio of radius 4:1 . Then respective ratio of their current rating will be

Electric fuse is a protective device used in series with an electric circuit or an electric appliance to save it from damage due to overheating porduced by strong current in the circuit or application. Fuse wire is generally made from an alloy of lead and tin, which has hifh resistance and low melting point. It is connected in series in an electric installation. If a circuit gets accidentally short-circuited, a large current flows, then fuse wire melts away, which causes a break in the circuit. The power through fuse (F') is equal to heat energy lost per unit area per unit time (h) (neglecting heat loses from ends of the wire). P = I^2R = h xx 2pirl [R = (rhol)/(pir^2)] where r and l are the length and radius of fuse wire, respectively. A Battery is described by its emf (E) and internal resistance (r). Efficiency of battery (eta) is defined as the ratio of the output to the input power. eta = (Output power)/(Input power) xx 100% But I= E//(R+r), input power = EI. Output power = EI - I^2r , then. eta = ((EI - I^2r)/(EI)) xx 10 (1-(Ir)/E) xx 100 =1 - (E/(R+r)) (r/E) xx 100 = (R/(R+r)) xx 100 We know that output power of a source is maximum when the external resistance is equal to internal resistance, i.e., R = r . Efficiency of a battery (nonideal) when delivering the maximum power is

The earthing of an electric appliance is useful only if the fuse is in the live wire. Give the reason.

What do you mean by power rating of an electrical appliance ? How do you use it to calculate the resistance of the appliance ?

ICSE-SAMPLE PAPER 2012-SECTION-II
  1. The diagram in Fig. shows the displacement time graph of a vibrating b...

    Text Solution

    |

  2. A cell is sending current in an external circuit. How does the termina...

    Text Solution

    |

  3. What is the role of fuse, used in series with any electrical appliance...

    Text Solution

    |

  4. What are the characteristic properties of fuse wire ?

    Text Solution

    |

  5. Write an expression for the electrical energy spent in the flow of cur...

    Text Solution

    |

  6. At what voltage is the alternating current supplied to our houses ?

    Text Solution

    |

  7. How should the electric lamps in a building be connected ?

    Text Solution

    |

  8. Three resistors are connected to a 6 V battery as shown in the figure...

    Text Solution

    |

  9. Three resistors are connected to a 6 V battery as shown in the figure...

    Text Solution

    |

  10. Three resistors are connected to a 6 V battery as shown in the figure...

    Text Solution

    |

  11. Write an expression for the heat energy liberated by a hot body.

    Text Solution

    |

  12. Some heat is provided to a body to raise its temperature by 25^(@)C. W...

    Text Solution

    |

  13. What happens to the average kinetic energy of the molecules as ice mel...

    Text Solution

    |

  14. A piece of ice at 0^(@)C is heated at a constant rate and its temperat...

    Text Solution

    |

  15. 40 g of ice at 0^(@)C is used to bring down the temperature of a certa...

    Text Solution

    |

  16. The diagram below shows a current carrying loop or a circular coil pas...

    Text Solution

    |

  17. The diagram below shows a current carrying loop or a circular coil pas...

    Text Solution

    |

  18. Draw a simplified labelled diagram of a hot cathode ray tube.

    Text Solution

    |

  19. Name a common device where a hot cathode ray tube is used.

    Text Solution

    |

  20. A certain nucleus X has a mass number 14 and atomic number 6. The nucl...

    Text Solution

    |