Home
Class 12
PHYSICS
Alternating current can not be measured ...

Alternating current can not be measured by D.C. Ammeter because

A

`AC` voltage pass through `DC` ammeter

B

Average value of complete cycle is zero

C

`AC` is virtual

D

`AC` change its direction

Text Solution

Verified by Experts

The correct Answer is:
B
In `DC` ammeter, a coil is free to rotate in the magnetic field of a fixed magnet.
If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average the of the torque will be zero.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    A2Z|Exercise AIIMS Questions|26 Videos

  • ATOMIC PHYSICS

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

Alternating currents can be produced by a

Alternating current can be produced by

Alternating current can be measured with the help of

In a circuit, the value of the alternating current is measured by hot wire ammeter as 10 ammeter. Its peak value will be

A galvanometer of resistance 50Omega is converted into an ammeter by connecting a low resistance (shunt) of value 1Omega in parallel to the galvanometer, S. If full - scale deflection current of the galvanometer is 10 mA, then the maximum current that can be measured by the ammeter is -

An ammeter consists of a galvanometer of a resistance 45 Omega shunted with a resistance of 3 Omega . If the current rating of that can be measured by the ammeter will be

A2Z-ALTERNATING CURRENT-Section D - Chapter End Test
  1. The power factor of an AC circuit having resistance (R) and inductance...

    Text Solution

    |

  2. An inductor of inductance L and ressistor of resistance R are joined i...

    Text Solution

    |

  3. Alternating current can not be measured by D.C. Ammeter because

    Text Solution

    |

  4. In a LCR circuit capacitance is changed from C to 2C. For the resonant...

    Text Solution

    |

  5. In an LCR series a.c. Circuit the voltage across each of hte component...

    Text Solution

    |

  6. For the circuit shown in the figure, the current through the inductor ...

    Text Solution

    |

  7. In a series LCR circuit, the voltage across the resistance, capacitanc...

    Text Solution

    |

  8. An ideal choke takes a current of 10 A when connected to an ac supply ...

    Text Solution

    |

  9. A direct current of 5 amp is superimposed on an alternating current I=...

    Text Solution

    |

  10. A group of electric lamps having a total power rating of 1000 watt is ...

    Text Solution

    |

  11. In a LCR circuit having L=8.0 Henry, C=0.5 mu F and R=100 ohm in serie...

    Text Solution

    |

  12. An alternating current source of frequency 100 Hz is joined to a combi...

    Text Solution

    |

  13. A 10 ohm resistance, 5 mH coil and 10mu F capacitor are joined in seri...

    Text Solution

    |

  14. A resistor R, an inductor L and a capacitor C are connected in series ...

    Text Solution

    |

  15. If power factor is 1//2 in a series RL circuit, R=100 Omega. AC mains ...

    Text Solution

    |

  16. A bulb is connected first with DC and the then AC of same voltage then...

    Text Solution

    |

  17. An AC supply gives 30 Vrmswhich passes through a 10 Omega resistance. ...

    Text Solution

    |

  18. The average power dissipation in a pure capacitance in AC circuit is

    Text Solution

    |

  19. In a series LCR circuit, at resonance, power factor is …….. .

    Text Solution

    |

  20. A bulb and a capacitor are in series with an AC source. On increasing ...

    Text Solution

    |