Physics
For parallel combination of resistances, which of the statements are correct ?
- On I-V graph, the slope of line is more.
- The potential difference across each resistance is same.
- The current in a resistor is inversely proportional to the resistance.
- All of the above
Answer
All of the above
Reason — For parallel combination of resistances :
- On I-V graph, the slope of line is more because resistance in parallel combination is less than series combination.
- The potential difference across each resistance is same because, the ends of each resistor are connected to the ends of the same source of potential.
- According to Ohm's Law V = IR. Hence, the current in a resistor is inversely proportional to the resistance.
Related Questions
In series combination of resistances —
- p.d. is same across each resistance
- total resistance is reduced
- current is same in each resistance
- all of the above are true
In parallel combination of resistances :
- p.d. is the same across each resistance
- current is the same in each resistance
- total resistance is increased
- all of the above are true
Assertion (A): The terminal voltage of a cell is always less than its e.m.f.
Reason (R): More the current drawn from the cell, the less is the terminal voltage.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Write the expressions for the equivalent resistance R of three resistors R1, R2 and R3 joined in (a) parallel, (b) series.