Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become n-type
The resistivity of the doped silicon piece will increase
The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become p-type

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Physics
A transformer

Converts AC voltage to D.C. voltage
Converts DC to AC
Converts electrical energy into mechanical energy
Is used to decrease or increase AC voltage

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