Question

A simple circuit exists with one light bulb. A resistor of equal resistance to the bulb gets placed in the circuit in parallel. Which of the following would occur?

A. The current would increase.
B. The total voltage would decrease.
C. The current would stay the same.
D. The total resistance would remain the same.

Answer 1

`{ \qquad\qquad\huge\underline{{\sf Answer}}}`

If we add a new residence in the circuit in parallel to the bulb of same resistance, the resultant resistance will get half the value of initial resistance [ when only bulb was connected in the circuit ], the current will increase as resultant resistance is half the original. and same current will flow in both the parallel wires.

So, by above information :

A.) Current would increase ? [ Yes ], As by ohms law, V = IR

and, if R is halfed, to maintain the same potential difference, current in the circuit will increase.

B.) Total voltage will decrease ? [ No ]... voltage will remain constant

C.) The current would stay the same ? [ yes ], it would increase...

D.) Total resistance would remain same ? [ No ], it will decrease...