Question

the potential difference between the terminals of an electirc heater is 80v when it draws a current is increased to 120v

Answer 1

Whenever sound these types of problems, one thing to remember is that the resistance is constant.


Let the initial current by I

By ohm's law,

V = I R

R = V/I
= 80/I

Let final current be I'
I' = V/ R

I'= 120/(80/I)

I'= 120 I / 80

∴ I' = 1.5I

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