Answers

2014-09-20T12:29:16+05:30
Here charge transferred Q=90000 C, time t=1 hour = 60*60=3600 s and potential difference V=50 V.
        I=Q/t
        I=90000/3600
        I=25
Now V=IR
        50=25*R
        50/25=R
        2=R
Now electric  power=I²R
                               25*25*2
=1250
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2014-09-20T12:35:40+05:30
power=Q*V/t
P=90000*40/3600
P=1000 W
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