Question

Many kitchens today are equipped with high-speed electrical gadgets, such as blenders and food processors, which are able to inflict as serious injuries as those caused by an industrial wood-planing machine.

Answer 1

Dear Student,

Given:

R1=5Ω

R2=10Ω

EMF=6V

A)

To get minimum current, the two resistors should be connected in series.

To get maximum current, we should connect the resistance in parallel

B)To calculate strength of total current in each case:

1) To get minimum current, the two resistors should be connected in series.

Effective resistance for series connection: R= R1+R2

R=5+10

R=15Ω

By Ohm's law, we have V=IR

so, I=V/R

⇒6/15⇒0.4A

I=0.4A

2) To get maximum current, we should connect the resistance in parallel.

Effective resistance for parallel connection: 1/R=1/R1+1/R2

1/R=R1+R2/R1R2

∴R=R1R2/R1+R2

⇒5x10/5+10

⇒50/15⇒10/3Ω

By Ohm's law, we have V=IR

so, I=V/R

⇒(6/10)x3⇒1.8A

I=1.8A

Hope its clear

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