Answer / shreyash

my friend it is not truely right that DC cannot be steped
up
here it is not mentioned that r we using transformer or not.
DC cannot be steped up by transformwer but can be steped up
by CHOPPERS.
but still i dont think that a 7 volt battery can run a 60
watt motor because if it is converted to AC & then steup up
than also i don't think it can feed 60 watts.

Answer / rvg.msceb

this is very basic question. DC cannot be steped up with
transformer.

Answer / lmn

If use relay, can run 60 W motor. An electrically operated
switch, for example a 9V battery circuit connected to the coil
can switch a 230V AC mains circuit.

Answer / md. zakir hosen

In this question it is not mentioned that what is the AH
(ampere hour)rating of battery. If we assume that battery is
20AH and 60w motor is running on ac 220v. So motor need
0.273amp.if we invert 7v dc into 220v ac then this motor
definitely run.

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Answer / pillay

can.
Because 60 watts motor consume 60/7 = 8.5 amps. Now if your motor is rated to run at 7 volts and your battery is big enough to give 8.5 amps than no problem.

Why are you like to join it job as a electrical engineering student?

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