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Switches and Lamps in a Parallel Circuit.
A switch at S1 or S5 will switch all the lamps off and
on together
(assume that all the other
switches are "closed" which means "on").
The switch at S2 will only
light the lamp at L1.
This is very useful because it means
that we can switch the lamp
on and off without affecting the other lamps.
The brightness of the lamp does not
change
as other lamps in parallel are switched
on or off.
For this reason lamps are always connected in parallel (except Fairy Lights).
Similarly, the switch at S3 will only
light the lamp at L2.
The switch at S4 will only
light the lamp at L3.
Headings Parallel Circuits Electricity Search Questions 
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