Question

A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then voltage across each resistor is
1. Halved
2. Doubled
3. Increases by 4 times
4. Remains the same

Answer 1

Correct Answer - Option 4 : Remains the same

• Even on changing the values of linear resistors, the voltage remains constant in the case of the ideal voltage source. 
• Ohm’s law defines current is proportional to the voltage when the load (resistance) is constant. 
• If the values of all the resistors are doubled, then the current across the resistor will be half. 
• If values of all the resistors are halved, then-current flow in each resistor becomes two times. 
• The voltage is distributed according to the ratio of resistors.
• Since doubling all resistor values does not change the ratio of resistors, the voltage drop across them stays the same.