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Standard VI

Physics

Electric Bulb

Two flash lig...

Question

Two flash light electric incandesccent lamps, each requiring $3 a m p$ at $1.5 V$ are placed in series and connected to a $6 V$ cell. What resistance must be connected in series to operate them?

22 Ω

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2 Ω

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6 Ω

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1 Ω

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Solution

The correct option is B $2 Ω$
resistance of each bulb,

$= \frac{V}{I} = \frac{1.5}{3} = 0.5 Ω$

If $R Ω$ is the required series resistance,

$\Rightarrow 3 = \frac{6}{R + 0.5 + 0.5} = \frac{6}{R + 1}$

$\Rightarrow R + 1 = \frac{6}{3} = 2$

$∴ R = (2 - 1) = 1 Ω$

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Two flash light electric incandesccent lamps, each requiring 3 amp at 1.5 V are placed in series and connected to a 6 V cell. What resistance must be connected in series to operate them?

The correct option is B 2 Ωresistance of each bulb,=VI=1.53=0.5ΩIf RΩ is the required series resistance,⇒3=6R+0.5+0.5=6R+1⇒R+1=63=2∴R=(2−1)=1Ω

Two flash light electric incandesccent lamps, each requiring $3 a m p$ at $1.5 V$ are placed in series and connected to a $6 V$ cell. What resistance must be connected in series to operate them?

The correct option is B $2 Ω$
resistance of each bulb,

$= \frac{V}{I} = \frac{1.5}{3} = 0.5 Ω$

If $R Ω$ is the required series resistance,

$\Rightarrow 3 = \frac{6}{R + 0.5 + 0.5} = \frac{6}{R + 1}$

$\Rightarrow R + 1 = \frac{6}{3} = 2$

$∴ R = (2 - 1) = 1 Ω$