Home
Class 12
PHYSICS
20Omega resistor is connected with the A...

`20Omega` resistor is connected with the A.C. source of V = 282sin (120 `pi`t), the current passing through the resistor will be ……..

A

14.1 A

B

10A

C

7.05 A

D

5A

Text Solution

Verified by Experts

The correct Answer is:
B
Comparing equation `V=282 sin (120pit)`
with the equation `V=V_m sin omegat`
`V_m`=282 V, `omega=120 pi` rad/s , R=20 `Omega`
`therefore I_(rms)=I_m/sqrt2`
`=V_m/(sqrt2R)=282/(1.41xx20)`=10 A
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION-D MCQs (COMPETITIVE EXAMS)|64 Videos

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION-C NCERT EXEMPLAR (Long Answer)|5 Videos

  • ATOMS

    KUMAR PRAKASHAN|Exercise Section-D -MCQs asked in GUJCET / Board Exam|34 Videos

Similar Questions

Explore conceptually related problems

In the circuit of adjoining figure the current through 12 Omega resistor will be

One inductor (of inductance L henry) is connected to an A.C. source, then the current flowing through the inductor I = ........ A.

When 1 mu F capacitor is connected across V = 100 sqrt2 sin(100t) Volt, current passing through milliammeter connected in the circuit is ……...

In a circuit, two resistors of resistances 5 Omega and 10 Omega are connected in series. Compare the current passing through the two resistors.

A coil of self inductance of 1H and resistance 200 Omega is connected to an A.C. source of frequency 200/pi Hz. The phase difference between voltage and current will be ...

Explain electrical energy when an ac current passes through a resistor.

20Omega resistance is connected to V = 220sin (100 pi t) voltage source. Time taken by current to reduce from maximum value to its rms value is .....

In the circuit diagram given in figure suppose the resistors R_1, R_2 and R_3 have the values 5Omega, 10 Omega, 30 Omega respectively, which have been connected to a battery of 12V. Calculate (a) the current through each resistor, (b) the total current in the circuit, and (c) the total circuit resistance.

KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)
  1. The current from an A.C. source is given by I = 2cos(omegat + phi) the...

    Text Solution

    |

  2. For an L-C-R series circuit, the Q-factor is …

    Text Solution

    |

  3. 20Omega resistor is connected with the A.C. source of V = 282sin (120 ...

    Text Solution

    |

  4. The sharpness of an L-C-R series resonance curve …...

    Text Solution

    |

  5. The value of half power bandwidth of resonance curve of L-C-R series c...

    Text Solution

    |

  6. Q - factor for resonance curve of L-C-R series circuit is defined as ....

    Text Solution

    |

  7. In a series L-C-R circuit R = 100Omega, L = 1H and C= 1 mu E The half ...

    Text Solution

    |

  8. A 10Omega resistance, 5mH inductor and 10muF capacitor are joined in s...

    Text Solution

    |

  9. In a series L-C-R, A.C. circuit, V1, V2 and V3 are the voltmeters conn...

    Text Solution

    |

  10. Figure shows two resonance current with same voltage source for L-C-R...

    Text Solution

    |

  11. If instantaneous current is given by i=4 cos (omegat+phi) ampere, tha...

    Text Solution

    |

  12. In an a.c. circuit , peak value of voltage is 423 volt. Its effective ...

    Text Solution

    |

  13. If E0 represents the peak value of the voltage in an a.c. circuit, the...

    Text Solution

    |

  14. The peak value of 220 volts of a.c. mains is ...... volt.

    Text Solution

    |

  15. In an A.C. circuit of inductance 50 mH with negligible resistance and ...

    Text Solution

    |

  16. An alternating current is given by the equation i = (i1 cos omegat + i...

    Text Solution

    |

  17. In a circuit, the value of the alternating current is measured by hot ...

    Text Solution

    |

  18. The frequency of an alternating voltage is 50 cycles/s and its amplitu...

    Text Solution

    |

  19. For a series L-C-R a.c.circuit at resonance, the statement which is no...

    Text Solution

    |

  20. An A.C. circuit consists of an Indicator of inductance 0.5H and a capa...

    Text Solution

    |