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Howmuch current is drawn by theprimary c...

Howmuch current is drawn by theprimary coil of atransformer, which steps down 220V to 44V to operate a device with an impedance of `440Omega`?

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`E_(p)= 220` volt, `E_(s)= 44` volt, `I_(p)= ?`
Impedance `= Z= 440 Omega`
`I_(s)= (E_s)/(Z)= (44)/(440)= (1)/(10)`
`I_(s)= 0.1A`
As the efficiency of transformer is 100%.
`therefore E_(p)I_(p)= E_(s)I_(s)`
`I_(p)= (E_(s)I_(s))/(E_p)= (44xx 0.1)/(220)`
`I_(p)= 0.02A`
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