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An ammeter of resistance 0.80 Omega can ...

An ammeter of resistance `0.80 Omega` can measure current upto 1.0 A.
(i) What must be the value of shunt resistance to enable the ammeter to measure current upto 5.0 A ?
(ii) What is the combined resistance of the ammeter and the shunt ?

Text Solution

Verified by Experts

(i) Shunt, `S=(R_(A)i_(g))/(i-i_(g))`
`=(0.8xx1.0)/(5.0-1.0)`
`=0.2 Omega`
(ii) Combined resistance of ammeter and shunt
`(1)/(R_("total"))=(1)/(R_(A))+(1)/(S)`
`=(1)/(0.8)+(1)/(0.2)`
`R_("total")=(0.8)/(5)`
`rArr R_("total")=0.16 Omega`
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