An alternating voltage V=140 sin 50 t is...

An alternating voltage V=140 sin 50 t is applied to a resistor of resistance 10 `Omega`. This voltage produces `triangleH` heat in the resistor in time `trianglet`. To produce the same heat in the same time, rquired DC current is

14 A

about 20 A

about 10 A

None of these

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(c )

An A.C source of voltage V = 100 sin (100 pi t) is connected to a resistor of resistance 20 Omega . The rms value of current through resistor is

`10 A`

`10/(sqrt2) A`

`5/(sqrt2) A`

None of these

0.16J

0.32J

0.64J

1.28J

120 V

`120 sqrt2V`

`(120)/(sqrt2) V`

none of these