Home
Class 12
PHYSICS
Three equal resistor connected in serie...

Three equal resistor connected in series across a source of enf together dissipate `10 Watt`. If the same resistors aer connected in parallel across the same emf, then the power dissipated will be

A

10 watt

B

30 watt

C

10/3 watt

D

90 watt

Text Solution

Verified by Experts

The correct Answer is:
D
In series, `P_(S) = P/n rArr 10 = P/3 rArr P = 30 `watt
In parallel, `P_(P) = nP = 3 xx 30 = 90` watt
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise PAST YEARS QUESTIONS |76 Videos

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise ASSERTION AND REASON|26 Videos

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise NCERT BASED QUESTIONS (DIFFERENT MEASURING INSTRUMENTS) |74 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

Three equal resistors connected in series across a source emf together dissipate 4 watt.If the same resistors are connected in parallel across the same emf the power dissipate will be

Three equal resistances connected is series across a source of e.m.f consume 20 watt. If the same resistor are connected in parallel across the same source of e.m.f., what would be the power dissipated ?

Three equal resistors connected in series across a source of emf together dissipate 10W of power. What would be the power dissipated if te same resistors are connected in parallel across the same source of emf?

(a) Two heater coils made of the same material are connected in paralled across the mains. The length of diameter of one the coil is triple that of other. Which of these will produce more heat? (b) Three equal resistors connected in series across a source of emf together dissipated 10 Watt of power. What would be the power disspated if the same resistors are connected in parallel across the same source of emf? Two resistor R_(1) and R_(2) may be connect either in series or in parellel across a battery of zero internal resistance. it is required that joule heating for the parallel combination be four times than for series combination. if R_(1)= 100 Omega find R_(2) (d) The three resistance A, B and C have values 3R, 6R and R respectively. Now some potential difference is applied across the network . Find the ratio of thermal powers dissipated between X and Y . find ratio of power consumed by A,B, and C .

Three equal resistors connected in series across a source of e.m.f. together dissipate 10 W of power. What should be the power dissipated if the same resistors are connected in parallel across the same source of e.m.f.

Three identical resistors, each of resistance R, when connected in series with a d.c. source, dissipate power X. If the resistors are connected in parallel to the same d.c. source, how much power will be dissipated ?

Three identical resistors, each of resistance R, when connected in series with a d.c. source, dissipata power X. if the resistors are connected in parallel to the same d.c. source, how much power will be dissipated?

3 identical bulbs are connected in series and these together dissipate a power P . If now the bulbs are connected in parallel, then the power dissipated will be

ERRORLESS-CURRENT ELECTRICITY-NCERT BASED QUESTIONS (HEATING EFFECT OF CURRENT)
  1. An electric motor operator on 15 V supply, draws a current of 5 A and ...

    Text Solution

    |

  2. A heater is designed to operate with a power of 1000W in a 100 V line....

    Text Solution

    |

  3. A resistor R(1) dissipates the power P when connected to a certain gen...

    Text Solution

    |

  4. Two identical heaters rated 220 V , 1000 W are paced in series with ea...

    Text Solution

    |

  5. Two bulbs of 100 W and 200 W working at 220 volt are joined in series ...

    Text Solution

    |

  6. Three electric bulbs of rating 60 W each are joined in series and then...

    Text Solution

    |

  7. Three electric bubls of 200W, 200 W and 400W are shown in figure. The ...

    Text Solution

    |

  8. When two resistances R1 and R2 are connected in series , they consume...

    Text Solution

    |

  9. Three equal resistor connected in series across a source of enf toget...

    Text Solution

    |

  10. Two electric bulbs marked 40W, 220V and 60W, 220V when connected in se...

    Text Solution

    |

  11. A 5^(@)C rise in the temperature is observed in a conductor by passing...

    Text Solution

    |

  12. A 12 V lead accumulator is being charged using 24 V supply with an ext...

    Text Solution

    |

  13. A coil takes 15 min to boil a certain amount of water, another coil ta...

    Text Solution

    |

  14. An electric kettle has two heating coils. When one coil is used, water...

    Text Solution

    |

  15. An immersion heater is rated 836 watt . It should heat 1 litre of wate...

    Text Solution

    |

  16. A wire of length L and 3 identical cells of negligible internal resist...

    Text Solution

    |

  17. A coil of wire of resistance 50 Omega is embedded in a block of ice. I...

    Text Solution

    |

  18. Flash light equipped with a new set of batteries, produces bright whit...

    Text Solution

    |

  19. The material of fuse wire should should have

    Text Solution

    |

  20. A fuse wire with radius 1 mm blows at 1.5 amp . The radius of the fuse...

    Text Solution

    |