A hot plate of an electric oven connected to a 220 V line Chapter 12: Electricity Science Class 10 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. 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 Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases? is solved by our expert teachers. You can get ncert solutions and notes for class 10 chapter 12 absolutely free. NCERT Solutions for class 10 Science Chapter 12: Electricity is very essencial for getting good marks in CBSE Board examinations

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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 Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases?
Ans: Supply voltage, V = 220 V
Here Resistance of one coil, R =24 Ω
(i) Coils are used separately
According to Ohm’s law, V=I1R1
I1 is the current flowing through the coil
I1=V/R1=220/24=9.166A
∴ current flow through the coil when used separately is 9.16 A.
(ii) Coils are connected in series
R2=24 Ω+24 Ω=48 Ω
According to Ohm’s law
I2=V/R2=220/48=4.58A
the current flowing through the series circuit is 4.58A
(iii) Coils are connected in parallel
$eqalign{ & {1 over {{R_3}}} = {1 over {24}} + {1 over {24}} cr & {1 over {{R_3}}} = {{1 + 1} over {24}} cr & {1 over {{R_3}}} = {2 over {24}} = {1 over {12}} cr & Rightarrow {R_3} = 12Omega cr} $

According to Ohm’s law
I3=V/R3=220/12=18.33A
the current flowing through the parallel circuit is 18.33A