Home
Class 12
PHYSICS
How much current is drawn by the primary...

How much current is drawn by the primary coil of a transformer which steps down 220 V to 22 V to operate device with an impedance of 220 ohm.

A

`1A`

B

`0.1 A`

C

`1 mA`

D

`0.1 mA`

Text Solution

Verified by Experts

The correct Answer is:
B
`i_(S)=(E_(S))/(Z)=(22)/(220)=0.1A`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise Example 2|28 Videos

  • ELECTROMAGNETIC INDUCTION

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise Example 30|1 Videos

  • ELECTROMAGNETIC INDUCTION

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CONER|34 Videos

  • ELASTICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|16 Videos

  • ELECTRONS AND PROTONS

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|19 Videos

Similar Questions

Explore conceptually related problems

Calculate the current drawn by the primary of a tarnsformer which steps down 200 V to 20 V to operate a device of resistance 20 ohm. Assume the efficiency of transformer to be 80 %

Calculate current drawn by primary coil of a transformer, Which steps down 200 V to 20 V to operate a device of 20 ohm resistance. Assume efficiency of transformer 80 %.

State the principle of working of a transformer. (b) Define efficiency of a transformer. (c ) State any two factors that reduce the efficiency of a transformer. (d) Calculate the current drawn by the primary of a 90% efficient transformer which steps down 220 V to 22 V , if the output resistance is 440 Omega .

(i) Draw a labelled diagram of a step-down transformer. State the principle of its working. (ii) Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer. (iii) How much current is drawn by the primary of a transformer connected to 220V supply when it delivers power to a 110V-550W refrigerator ?

A transfomer steps down 220 volt to 11 volt. What is the transformation ratio ?

In an ideal step down transformer, the input voltage is 400V and the output voltage is 20 V. The output voltage is used to operate a device, having an impendance of 100 ohms. What is the current in the primary circuit?

A current of 2A is flowing at 220 V in the primary coil of a transformer. If current in the secondary coil is 1 A and efficiency of the transformer is 80% then the voltage produced in the secondary coil will be

A current of 5A is flowing at 220V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50% of power is lost, then the current in the secondary coil will be –

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ELECTROMAGNETIC INDUCTION-Example 1
  1. in a step-up transformer, the turn ratio is 1:2 leclanche cell (e.m.f....

    Text Solution

    |

  2. The core of any transformaer is laminated so as to

    Text Solution

    |

  3. How much current is drawn by the primary coil of a transformer which s...

    Text Solution

    |

  4. In an ideal transfomer, the voltage is step-down from 11 kV to 220 V. ...

    Text Solution

    |

  5. For a large industrial city with much load variations, the DC generato...

    Text Solution

    |

  6. In an ideal transfomer, the voltage is step-down from 11 kV to 220 V. ...

    Text Solution

    |

  7. When power is drawn from the secondary coil of the transformer, the dy...

    Text Solution

    |

  8. An electric motor runs a D.C. source of e.m.f. 200 V and draws a curre...

    Text Solution

    |

  9. In step-up transfomer, the relation between number of turns in primary...

    Text Solution

    |

  10. A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains....

    Text Solution

    |

  11. The armature of a DC motor has 20Omega resistance. It draws a current ...

    Text Solution

    |

  12. Voltage in the secondary coil of a transfomer does not depend upon

    Text Solution

    |

  13. A step up transformer operates on a 230 V line and a load current of 2...

    Text Solution

    |

  14. The armature of a shunt wound motor can with stand current up to 8 A b...

    Text Solution

    |

  15. A step-down transformer has 50 turns on secondary and 1000 turns on pr...

    Text Solution

    |

  16. A six pole generotar with fixed field excitation developes an e.m.f. o...

    Text Solution

    |

  17. A step-down transfomer reduces the voltage of a transmission line from...

    Text Solution

    |

  18. The e.m.f. induced in a secondary coil is 20000 V when the current bre...

    Text Solution

    |

  19. A current of 5A is flowing at 220V in the primary coil of a transforme...

    Text Solution

    |

  20. Eddy currents are produced when

    Text Solution

    |