Calculate the current show by the ammeter `A` in the circuit diagram

Answer

`6.0 A`

Explanation

The equivalent circuit of
Effective resistance `R` between A and B is
`(1)/(R ) = (1)/( 10 + 10) + (1)/(2) xx (1)/(5) = (1)/(10 + 10) = (10)/(20) = (1)/(2)`
`R = 2 Omega`
`:.` Current in ammeter `I = (12)/(2) = 6.0 A`