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An inductor coil, a capacitor and an AC source of rms voltage 24 V are connected in series. When the frequency of the sources is varied, a maximum rms current of 6A is observed. If this inductor coil is connected to a battery of emf 12 V and internal resistance `4.0 Omega`. what will be the current ?

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`E_(rms) = 24 V`, `r=40`, `I_(rms) = 6A`
`R=E/I_(rms) = 24/6 = 4 Omega`
Internal Resistance `=4 Omega`
Hence net resistance `=4 +4=8 Omega`
:. `Current = 12/8 1.5A`
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