Home
Class 12
PHYSICS
Four identical electrical lamps are labe...

Four identical electrical lamps are labelled `1.5 V` `0.5 A` which describes the condition necessary for them to operate at normal brightness. A `12 V` battery of negligible internal resistance is connected to lamps as shon, then

A

The value of R for normal brightness of each lamp is `(3//4)Omega`

B

The value of R for normal brightness of each lamp is `(21//4)Omega`

C

Total power dissipated in circuit when all lamps are normally bright is 24 W

D

Power dissipated in R is 21 W when all lamps are normally bright

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • HEATING AND CHEMICAL EFFECT OF CURRENT

    ERRORLESS |Exercise Heating Effect of Current|2 Videos

  • HEATING AND CHEMICAL EFFECT OF CURRENT

    ERRORLESS |Exercise Chemical Effect Current|1 Videos

  • ELECTROSTATICS

    ERRORLESS |Exercise Ordinary Thinking Objective Questions (Electric Flux and Gauss.s Law)|28 Videos

  • KINETIC THEORY OF GASES

    ERRORLESS |Exercise QUESTIONS|126 Videos

Similar Questions

Explore conceptually related problems

A battery of emf 2V and internal resistance 0.5(Omega) is connected across a resistance in 1 second?

Four resistors of 12 Omega each are connected in parallel . Three such combinations are then connected in series. What is the total resistance ? If a battery of 9 V emf and negligible internal resistance is connected across the networks, find the current flowing through of each resistors.

Three resistances 2Omega, 4Omega, 5Omega are combined in series and this combination is connected to a battery of 12 V emf and negligible internal resistance. The potential drop across these resistances are

Four equal resistance dissipated 5 W of power together when connected in series to a battery of negligible internal resistance . The total power dissipated in these resistance when connected in parallel across the same battery would be .

A potentiometer wire has length 10 m and resistance 20Omega . A 2. 5 V battery of negligible internal resistance is connected across the wire with an 80 Omega series resistance. The potential gradient on the wire will be

A series combination of two resistors 1 Omega each is connected to a 12 V battery of internal resistance 0.4 Omega . The current flowing through it will be

Two tungston lamps with resistance R1 and R2 respectively at full incandescence are connected first in parallel and then in series, in a lighting circuit of negligible internal resistance. It is given that R1 gt R2 . Which lamp will glow more brightly when they are connected in parallel ?

A 5 V battery with internal resistance 2Omega and a 2V battery with internal resistance 1Omega are connected to a 10Omega as shown in the figure. The current in the 10Omega resistance is

Three resistors of resistances 3Omega, 4Omega and 5Omega are combined in parallel. This combination is connected to a battery of emf 12V and negligible internal resistance, current through each resistor in ampere is

An electric bulb operates at 12 V d.c. If this bulb is connected to an a.c. source and gives normal brightness, what would be the peak value of the source ?