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

30Watt

C

`10//3 Watt`

D

`90Watt`

Text Solution

Verified by Experts

The correct Answer is:
D
`P_(1) = 10 = (V^2)/(3R) , P_(2) = (V^2)/(R//3)`
`(P_2)/(P_1) = 9 implies P_(2) = 9P_(1) = 90 W`.
Promotional Banner

Topper's Solved these Questions

  • THERMAL AND ELECTRIC EFFECT oF CURRENT

    CP SINGH|Exercise Exercises|101 Videos

  • SEMICONDUCTORS

    CP SINGH|Exercise Exercises|140 Videos

  • WAVE NATURE OF LIGHT

    CP SINGH|Exercise EXERCISES|140 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

CP SINGH-THERMAL AND ELECTRIC EFFECT oF CURRENT-Exercises
  1. Two indential heated produce heat H(1) in time t when connected in par...

    Text Solution

    |

  2. A 500W heating unit is designed to operate from a 115 "volt" line. If...

    Text Solution

    |

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

    Text Solution

    |

  4. A current of 3 A flows through the 2 Omega resistor as shown in the ci...

    Text Solution

    |

  5. A heater coil is cut into two parts of equal length and one of them is...

    Text Solution

    |

  6. The three resistance of equal value are arranged in the different comb...

    Text Solution

    |

  7. For ensuring dissipation of same energy in all three resistors (R(1), ...

    Text Solution

    |

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

    Text Solution

    |

  9. An electric kettle has two coils. When one coil is switched an it tak...

    Text Solution

    |

  10. An electric kettle has two heating coils. when one coil is used, water...

    Text Solution

    |

  11. An electric kettle of 1200Whas 1 kg water at 20^@C. The water equivale...

    Text Solution

    |

  12. Water of volume 2 litre in a container is heated with a coil of 1kW at...

    Text Solution

    |

  13. The power dissipated 6 Omega resistor is

    Text Solution

    |

  14. Figure 7.37 shows a network of three resistances. When some potential...

    Text Solution

    |

  15. Which of the following plots may represent the thermal energy produced...

    Text Solution

    |

  16. The charge flowing in a conductor varies with times as Q = at - bt^2. ...

    Text Solution

    |

  17. The charge flowing through a resistance R varies with time t as Q = at...

    Text Solution

    |

  18. Two resistors having equal resistances are joined in series and a cur...

    Text Solution

    |

  19. A cell of emf epsilon and internal resistance r drives a current i thr...

    Text Solution

    |

  20. Current i is being driven through a cell of emf epsilon and internal r...

    Text Solution

    |