We don't use an 'instrument' to covert a.c. to d.c.. Rather, we use a circuit called a 'rectifier'.
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A resistor, by itself, can not convert DC into AC.
A transformer cannot convert AC into DC.
We use the "MOTOR GENERATOR SET" to convert the DC power to AC power we use DC motor and ac generator in it. It is very efficient way to convert the DC power to AC power.
to convert pulsed AC to something approximating DC.
A "Rectifier" converts AC current to pulsating DC current.