A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are

A. 5 Ω & 20 %

B. 25 Ω & 20 %

C. 5 Ω & 16.7 %

D. 25 Ω & 16.7 %

Answer: Option B