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

By:milan-ransingh

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## Answers

Solution:

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**

According to Ohm’s law

I3=V/R3=220/12=18.33A

the current flowing through the parallel circuit is

**18.33A**13priya

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