Question

hot plate of an oven connected to a 220 volt line has two resistance coils A and B each of 220 ohms resistance​

Answer 1

Explanation:

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