Is Work Done by a Voltage Source Positive or Negative When Current Opposes EMF?

[hackhard]

Is the work done by a constant voltage source positive or negative when current is opposite to emf?

 

[Dale]

Negative

 

[hackhard]

Negative

when current enters positive terminal of voltage source, voltage source charges up , so it gains energy , its power(energy derivative) is positive
shoudnt work done (power integral)be positive?

 

[SlowThinker]

Work done by the voltage source is negative because it receives energy.
Work done by whatever current source you have, is positive.

 

[Dale]

when current enters positive terminal of voltage source, voltage source charges up , so it gains energy , its power(energy derivative) is positive
shoudnt work done (power integral)be positive?

Work done on the source is positive. You asked about work done by the source, which is negative.