Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2019

PhysicsEasysingle choice

An ammeter of resistance $1.5 Ω$ can measure currents upto $1 A$ . The value of shunt resistance to measure current upto $4 A$ is

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Answer:

Solution:

Given, for an ammeter, $I_{g} = 1 A, R_{g} = 1.5 Ω$

Total current, $I = 4 A$

If $R_{s}$ be the shunt resistance, then according to the question circuit diagram is given, $(R_{s} ‖ R_{g},$ hence have equal potential difference $)$

where, $I_{g} R_{g} = (I - I_{g}) R_{s}$

$R_{s} = \frac{I_{g}}{I - I_{g}} \times R_{g} = \frac{1}{4 - 1} \times 1.5 = 0.5 Ω$

Stream:BITSATSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2019

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