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When a potential difference 30V is appli...

When a potential difference 30V is applied across a resistors, it draws a current of 3A. If 20V is applied across the same resistor, what will be the current ?

Text Solution

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Situation : 1
`V_(1)=30V,I_(1)=3A`
`R=(30)/(3)=10Omega(becauseR=(V)/(I))`
Situation : 2
`V_(2)=20V,I_(2)=?`
`R=10Omega" "(because"The resistor is same")`
`I_(2)=(V_(2))/(R)=(20)/(10)=2"amperes."`
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