Home
Class 12
PHYSICS
Two cities are 150 km apart. Electric po...

Two cities are 150 km apart. Electric power is sent from one city to antoerh city through copper wires. The fal of potential per km is 8 volt and the average resistance per km is `0.5Omega`. The power loss in the wire is

A

19.2 J

B

12.2 kW

C

19.2 W

D

19.2 km

Text Solution

Verified by Experts

The correct Answer is:
D
Resistance `= 150 xx 0.5 = 75 Omega`
`I = (DeltaV)/(DeltaR) = 8/0.5 = 16 A`
`P = I^(2)R =(16)^(2) xx 75 = 19200 W = 19.2` kW
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise ASSERTION AND REASON|26 Videos

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise NCERT BASED QUESTIONS (HEATING EFFECT OF CURRENT)|67 Videos

  • ATOMIC AND NUCLEAR PHYSICS

    ERRORLESS|Exercise Assertion and Reason|23 Videos

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos

Similar Questions

Explore conceptually related problems

Two cities are 80 km apart. The electric power is sent from one city to another city through copper wires. The fall tp potential per km is 8 V and average resistance per km is (0.25 Omega) . The power loss in wire is

Two cities are 80 km apart . The electric power is sent from one City to another city through copper wires . The fall of potential per km is 8 V and average resistance per km is 0.25 omega . The power loss in wire is

Two cities are 200km apart. Electric power is sent from one city to another city through copper wires. The fall of potential is 4V per km and average resistance per km in 0.2Omega . The power loss in the wire will be

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wire. The fall of km is 0.5 Omega . The power less in the wire is

(a) Draw the diagram of a device which is used to decrease high S voltage into a AC voltage and state its working principle. Write four sources of energy loss in this device. (b) A small town with a demand of 1200 kW of electric power at 220 V is situated 20 Km away from an electric plant generating power at 440V. The resistance of the two wire line carrying power is 0.5 Omega per km. The town gets the power from the line through a 4000-220 V step-down transformer at s sub-station in the town. Estimate the line power loss in the from of heat.

A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two line wires carrying power is 0.5 Omega per km. The town gets power from the lines through a 4000-220 V step down transformer at a substation in the town. Estimate the line power loss in the form of heat. (b) How much power must the plant supply. assuming there is negligible power loss due to leakage? (c) Characterize the step up transformer at the plant.

A village with a demand of 800 kW electric power at 220 V is located 30 km from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.25 Omega /km. The village gets power from the line through a 4000 V – 220 V step down transformer at a sub-station in the village. Assume negligible power loss in the transformers (a) Estimate the power loss in form of heat in the transmission line. (b) How much power must the plant supply? (c) What is the input and output voltage of step-up transformer at the plant ? (d) What difference will it make if the village receives power through a 40,000 V – 220 V step down transformer

A car driver cover same distance between two cities at a speed of 60km/h and on there turn his speed is 40 km/h.He goes again from the 1st to the 2nd city at twice the original speed and returns at half the original return speed. Find his average speed for the entire journey.

ERRORLESS-CURRENT ELECTRICITY-PAST YEARS QUESTIONS
  1. Eels are able to generate current with biological cells called electro...

    Text Solution

    |

  2. The power dissipated in the circuit shown in the figure is 30 Watts. T...

    Text Solution

    |

  3. Two cities are 150 km apart. Electric power is sent from one city to a...

    Text Solution

    |

  4. A battery is charged at a potential fo 15 V for 8 h when the current f...

    Text Solution

    |

  5. You are given several identical resistors each of value 10Omega and ea...

    Text Solution

    |

  6. A battery consists of a variable number n of identical cells having in...

    Text Solution

    |

  7. A cell having an emf E and internal resistance r is connected across a...

    Text Solution

    |

  8. The resistance of the four arms P, Q, R and S in a Wheatstone's bridg...

    Text Solution

    |

  9. In a meter bridge , the balancing length from left end ( standard ...

    Text Solution

    |

  10. A galvanometer having a coil resistance of 60 Omega shows full scale...

    Text Solution

    |

  11. The resistance of 1 A ammeter is 0.018 Omega . To convert it into 10 ...

    Text Solution

    |

  12. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8...

    Text Solution

    |

  13. A milli voltmeter of 25 milli volt range is to be converted into an am...

    Text Solution

    |

  14. A galvanometer of resistance 50Omega is connected to a b attery of 3V ...

    Text Solution

    |

  15. If voltage across a bulb rated 22 volt 100 watt drops by 2.5% of its r...

    Text Solution

    |

  16. A potentiometer circuit is setup as shown. The potential gradient acro...

    Text Solution

    |

  17. A potentiometer circuit has been set up for finding the internal r...

    Text Solution

    |

  18. A potentiometer wire of Length L and a resistance r are connected in s...

    Text Solution

    |

  19. A potentiometer wire is 100 cm long hand a constant potential differen...

    Text Solution

    |

  20. A potentiometer is an accurate and versatile device to make electrical...

    Text Solution

    |