Question

Which of the 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${}^2\Omega$s

• A. (i) , (ii)
  
• B. (ii), (iii), (iv)
  
• C. (i), (ii), (iv)
  
• D. (i), (ii), (iii), (iv)

Answer 1

The correct option is C (i), (ii), (iv)

Using $E=Pt$ $⟹$ Energy can be expressed in $Wh$

Using $W=qV$ $⟹$ Energy can be expressed in $VC$

Using $H=i^{2}Rt$ $⟹$ Energy can be expressed in $A^2\Omega s$

Whereas Energy cannot be expressed by $VA{s}^2$

Hence option C is correct.