Question

A hot plate connected to a 220 V line has two resistance coils A and B, each of 22ohm resistance. Calculate the amount of electric current flowing when these coil are:
(i) used individually.
(ii) connected in series.
(iii) connected in parallel​

Answer 1

Explanation:

Solution (i)

I = V/R

=> 220/22

=> 10ampere

Solution (ii)

R = R1 + R2

=> 22 + 22

=> 44ohm

Solution (iii)

1/R = 1/R1+ 1/R2

=> 1/22 + 1/22

=> 2/22

=> 11ohm

Now

I = 220/11

I = 20 ampere