Question

In case the two cells are identical each of emf E=5v and internal resistance r=2ohm calculate the voltage across the external resistance R=10ohm

Answer 1

ANSWER

The condition for delivering maximum power is that the external resistance is equal to the internal resistance.

Here,

RAB=R=re/r+r=r/2

Answer 2

Answer:

V=4.54 volt.

Explanation:

Eeq = (E1r2 + E2r1)/r1×r2

= ( 5×2 + 5×2 ) / 2×2

= 10+10 / 4

= 20/4 = 5 volt

req = (r1r2)/ r1+r2

= 2×2/ 2+2

= 4/4 = 1 ohm

I = E/ R+r

= 5/10+1

= 5/11 A

V=IR

= (5/11)× 10

= 50/11

= 4.54 Volt