Question

Name the switch/switches to be closed so as to light all the three lamps.

• A. 2 and 3
• B. 1 and 3
• C. only 2
• D. 1 and 2

Answer 1

The correct option is A 2 and 3

Components connected in series are connected along a single path, so the same current flows through all of the components. The current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component. In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. A circuit composed solely of components connected in series is known as a series circuit.
In this case, the 3 bulb are connected in series except that a battery is connected across the first bulb.
Hence, for all the three bulbs to glow the switches 2 and 3 has to be closed irrespective of the switch 1 whether closed or open.