A current in a circuit is due to a potential difference of 30 V applied to a resistor of resistance `300 Omega`. What resistance would permit the same current to flow, if the supply voltage was 300 V ?

Options

A. `3 k Omega`
B. `6 k Omega`
C. `9 k Omega`
D. `300 Omega`

Answer

A

Explanation

When V = 30 V and `R = 300 Omega`
The current is `I=(V)/(R )=(30)/(300)=0.1A`
If now the voltage is increased to 300 V and same current has to be maintained, then the resistance required given by
`R=(V)/(I) rArr R = (300)/(0.1)=3 k Omega`