Page 138 - SK Year 5 Science DLP

Chan also tested the condition of the bulbs when one of the switches is
opened or closed in the parallel circuit that he has built.

Why does the other bulb still light
up although one of the switches in
the parallel circuit is opened?

Switch X is opened A Switch X is closed A

Switch Y is closed B Switch Y is opened B

When switch X in the first branch of When switch Y in the second branch
the electric circuit is opened, bulb A of the electric circuit is opened, bulb
in the first branch does not light up B in the second branch does not
because the circuit on this branch light up because the circuit on this
becomes an incomplete circuit and branch becomes an incomplete circuit
the electric current cannot flow and the electric current cannot flow
through it. through it.

Bulb B in the second branch Bulb A in the first branch
of the electric circuit still lights of the electric circuit still
up because electric current lights up because electric
can flow through this branch. current can still flow
through this branch.
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