Question

In the circuit shown in the figure.
i) Would any of the bulbs glow when the switch is in the off position?
ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ON position?

Answer 1

This question is based on the simple fundamental of current flowing in a circuit as we know when the circuit is closed then only current will flow but if circuit is not closed then current will not flow in a circuit.

Complete answer:

As we know that current only flows when circuit is closed by using this fundamental phenomena we will find the solution.
i) Would any bulb glow when the switch is in the off position?
If the switch is in off position then the circuit will not remain closed therefore current will not flow in this position of a switch.
Therefore none of the bulbs will glow given in the circuit.
ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ON position?
If the switch is in one position then the circuit will make a closed loop or we can say the given circuit is complete therefore all three bulbs will glow at the same time.

Additional information:
Resistance:-
Resistance is the measure of the position applied to the flow of the electric current by any entity. A resistor is an electronic constituent that is used for the purpose of providing the particular amount of the resistance in the circuit.
Ohm’s law:-
Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it provided all the physical conditions and temperature remain constant.

Note:
As an approach to solve this question first we saw the fundamental phenomena which state that current flows in a circuit only when circuit is in closed loop or circuit is complete therefore in the first condition circuit is incomplete hence none of the bulb will glow and in second case circuit is complete and all bulb are in series therefore all the bulb will glow at a same time.