# Q.13.    A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of $24\Omega$ resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?

Given : V=220V and Resistance of each coil=R =24A

When coil is used separately,current in coil is

$I=\frac{V}{R}=\frac{220}{24}=9.16A$

When two coils are connected in series, net resistance is

$R=R_1+R_2=24+24=48\Omega$

current in coil is I'

$I'=\frac{V}{R}=\frac{220}{48}=4.58A$

When two coils are connected in parallel, net resistance is

$\frac{1}{R}=\frac{1}{24}+\frac{1}{24}=\frac{2}{24}$

$\Rightarrow R=12\Omega$

current in the coil is I''

$I''=\frac{V}{R}=\frac{220}{12}=18.33A$

## Related Chapters

### Preparation Products

##### JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
##### Rank Booster NEET 2021

This course will help student to be better prepared and study in the right direction for NEET..

₹ 13999/- ₹ 9999/-
##### Knockout JEE Main April 2021 (Easy Installments)

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 4999/-
##### Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-