WHAT’S HAPPENING
Once again, there are four possible
combinations. But this time, the bulb
lights up with three of them and
stays off with just one.
This kind of parallel arrangement
of switches is called an
OR circuit.
The bulb lights up when switch 1
OR switch 2 is turned on. Only
when both are switched off will it
fail to shine (figure 1).
One or the other
Of course, you can also hook up the two
switches in parallel. How does the current
behave when you do that?
HERE’S HOW
Assemble the illustrated circuit (figure 1).
Try all the different switch settings again.
With which ones will the bulb light up
now?
Trace the course of the current with the
help of figure 2.
EXPERIMENT 11
SWITCH SETTINGS
Switch 1
Switch 2
Light
left
left
off
right
right
lights up
left
right
lights up
right
left
lights up
14
1
2
Summary of Contents for Electricity and Magnetism 620417
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