Question

In which circuit will the bulb or bulbs glow the brightest?
A) A simple circuit with one bulb and one cell B) A simple circuit with one bulb and two cells C) A simple circuit with two bulbs and one cell D) A simple circuit with two bulbs and two cells

Answer 1

answer option b as more current will pass then increse in resistance will take palce such that it will glow more brightee

Answer 2

Answer:

The correct option is (B): A simple circuit with one bulb and two cells.

Explanation:

• The circuit having maximum output power will have the bulb which glows the brightest.

• The power depends on three elements: Current, Voltage, and Resistance.
• To find the power we can use the following expressions:

                        Power (P) = current (I)² × Resistance(R)

or,

                       Power(P) = Voltage(V)² ÷ Resistance(R)

• We know that the bulb provides resistance to the circuit while the cell provides a voltage supply.

Step-1

Considering  1st option: One Bulb and One cell

Then we have,        Voltage = V

                                Resistance = R

                                Output power = V²/R

Step-2

Considering the 2nd option: One bulb and two cells

Then we have,         Voltage = 2V

                                 Resistance = R

                                 Output power = (2V)²/R

                                                          = 4V²/R

Step-3

Considering the 3rd option: two bulbs and one cell

Then we have,         Voltage = V

                                 Resistance = 2R

                                 Output power = V²/2R

                                                         = V²/2R

Step-4

Considering the 4th option: two bulbs and two cells

Then we have,         Voltage = 2V

                                 Resistance = 2R

                                 Output power = (2V)²/2R

                                                          = 4V²/2R

                                                          =  2V²/R

• We can see that the output power in the 2nd option (i.e, Option B) is the highest

Therefore, a simple circuit with one bulb and two cells will have the highest output power and thus will have the brightest glowing bulb.