Question

when a resistor of 11ohm connected series with electric cell the current flowing us 0.5A in stead resistance 5ohm is connected to same electric cell in series current increases by 0.4A the internal resistance of cell​

Answer 1

Answer:

How many 176 resistors (in parallel) are required to carry 5 A in 220 V line?

Sol. Here, I = 5A, V = 220 V.

Resistance required in the circuit, R =

V 2 20 V 4 4

I 5 A , Resistance of each resistor, r = 176

If n resistors, each of resistance r, are connected in parallel to get the required resistance R, then

R = r

n

or 44 = 17 6

n

or n =

17 6

4 4

= 4