Question

four cells each of 1.5V and internal resistance 0.5 ohm are connected in series but one cell is connected with opposite polarity. The net voltage and internal resistance is​

Answer 1

Answer:

The cells are connected in series hence, the equivalent of internal resistances of cells is

r=  

4

1

​  

+  

4

1

​  

+  

4

1

​  

+  

4

1

​  

 

r=  

4

4

​  

=1Ω

One of the cells is incorrectly connected because its terminals are reversed.  

The cell has equal emf hence in series total emf is

E=1.5−1.5+1.5+1.5=3V

Let, the external resistance is, R=1Ω  

The current in circuit is

I=  

R+r

E

​  

 

I=  

1+1

3

​  

 

I=  

2

3

​  

=1.5A

Explanation: