I am currently interning at a science educational center and for my project, I am creating a simple and educational circuit using batteries, resistors, and light bulbs. The purpose of this circuit is to educate elementary school kids on the concepts of series and parallel circuit. By flipping the switch, they can distinguish the the difference between resistors connected in series and parallel by comparing the brightness.
All 4 resistor values are 1K with 4.5V as input. The specification of the light bulbs are 1.5V @ 0.3A. I have tested all the light bulbs (without resistors) and they are all fully functional. The schematics is shown below.
However, the bulbs that are connected to the resistor do not light up. When I used the multimeter measuring from B to point A, it reads 4.5V and when I tried to measure from point A with respect to the ground, it reads 0V.
I know this violates KVL as
Vf = VR1 + VR2 + Vb. I cannot figure out why I am getting 4.5V drop through the 2 resistors instead of the 2 resistors plus the bulb. I also tried to up the voltage by using a 9V battery, but the results came back the same. Could it be because the light bulbs are not compatible with resistors?
Thanks in advance.
(Note: My supervisor prefers light bulb over LED even though I tried to convince him to use LED...)