Which ofthe following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.
(i) Wh
(ii) VC
(iii) VAs $^{2}$
(iv) A $^{2} Ω$ s

(i), (ii)

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(ii), (iii), (iv)

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(i), (ii), (iv)

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(i), (ii), (iii), (iv)

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Solution

The correct option is C (i), (ii), (iv)
$E n e r g y = P o w e r \times t i m e = w a t t \times h o u r = W h$

For capacitor $= U = \frac{1}{2} c h a r g e \times V$

Hence $C V$ has same dimension as energy.

For a resistor, $H = V I t = V A s$

$H = I^{2} R t = A^{2} Ω s$

Hence $(i), (i i)$ and $(i v)$ represent energy.

Answer-(C)

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Which ofthe following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.(i) Wh(ii) VC(iii) VAs2(iv) A2Ωs

The correct option is C (i), (ii), (iv)Energy=Power×time=watt×hour=WhFor capacitor=U=12charge×VHence CV has same dimension as energy.For a resistor, H=VIt=VAsH=I2Rt=A2ΩsHence (i),(ii) and (iv) represent energy.Answer-(C)

Which ofthe following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.
(i) Wh
(ii) VC
(iii) VAs $^{2}$
(iv) A $^{2} Ω$ s