Answer to Question #102407 in Electric Circuits for james samuel damilola

Question #102407
A moving coil instruments gives a full scale deflection with a potential difference of 70mV and a current of 20mA calculate the value of the shunt required to give a range of 0-50Amps.
1
Expert's answer
2020-02-06T09:27:27-0500

As per the given question,

the potential difference with the full scale deflection=70mV

The current reading with the full scale deflection=20mA

Resistance of the shunt=?

Range of the current =0-50A

So, G=Vi=7020=3.5ΩG=\dfrac{V}{i}=\dfrac{70}{20}=3.5\Omega

We know that, S=IG×GIIGS=\dfrac{I_G \times G}{I-I_G}

S=3.5×20×1035020×103=0.07500.02S=\dfrac{3.5\times20\times10^{-3}}{50-20\times 10^{-3}}=\dfrac{0.07}{50-0.02}

S=0.0749.08=0.00142ΩS=\dfrac{0.07}{49.08}=0.00142\Omega

Or, S=1.42×103Ω1.42\times 10^{-3}\Omega


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Comments

Assignment Expert
07.02.20, 17:34

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james samuel damilola
07.02.20, 14:41

Thanks a lot,I'm very grateful

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