Question

There are two resistances of 3 ohm and 5 ohm. Which
of the resistances will be hotter, if the two resistances joined:
(i) in series and
(ii) in parallel are connected to a cell ?​

Answer 1

Answer:

(i)in series,5ohm resistor will be hot.

Because in series connection current has only one path to flow.Since current and resistance are directly proportional to heat (H=I^RT) and current is constant in this case,so obviously heat depends on resistance.Since resistance is more for 5ohm,more heat will be developed on it.

(ii)In parallel,3ohm will be hotter than 5ohm.

This is because in parallel connection,current has many paths to flow.So obviously current will take the path that has less resistance.(current can flow easily through a path that has less resistance,that's why)So it will flow through the 3ohm resistor.Again,as resistance , current and heat are directly proportional.More current means more heat.So 3ohm will be hot.

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