Four cells each of e m f 1 5V and internal resi... - JAMB Physics 1999 Question
Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?
A
6.0V, 16Ω
B
6.0V, 1Ω
C
1.5V, 4Ω
D
1.5V, 1Ω
correct option: d
Since all the cells are connected in parallel, the effective e.m.f. is just that of one single cell. Which means e.m.f. = 1.5V
However, the effective internal resistance adds as parallel arrangement given as
1/r = 1/r1 + 1/r2 + 1/r3 + 1/r4
= 1/4 + 1/4 + 1/4 + 1/4
= 1Ω
∴ r = 1Ω
Answer = 1.5V, 1Ω
Please share this, thanks:
#JAMB #JAMB
Add your answer
No responses