07 August 2022

Circuit Theory



Unit of voltage is/are




a) volt



b) joules/coloumb


c) Nm/C



d) All the above





Correct Answer: Option D

Solution:

Voltage is nothing but how much Work-done is needed in moving a unit charge from infinity to a point against the influence of electric field. 

Voltage = Work-done per unit charge$$V (t)=\frac {dW}{dq}$$ 
Unit:
  • volt (V) 
  • Joules/Coloumb (since work-done per unit charge) 
  • Also, Work done = Force × distance, hence unit of voltage can be Nm/C (Newton - metre / Coloumb)

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