7th science | Electricity -4 | series and parallel circutes in batteries and bulbs
parallel connection,
series connection,
electricity,
Electric current,
In a series circuit, electricity has only one path to flow through. All the electrical components are connected in this path. If any one of them is removed or is not functioning properly, the circuit will be incomplete.
A parallel circuit has more than one path for
the flow of electricity. Each bulb in the circuit
is connected in a separate path through which electricity can flow.
the positive terminal of the first cell and the negative terminal of the second cell are connected to the bulb.
You may use three or four cells in the same
manner. The bulb glows brighter and brighter.
Thus by connecting cells in series, we get a
battery. The battery cells in the torch are in
series.
Connecting Electric cells in Parallel:
all the positive terminals of the three cells are connected together and all the three negative terminals are connected together. These three positives and three negatives are connected to a bulb.
Connect this to a dry cell. Observe the
brightness of each of the three bulbs. Now
connect one more dry cell in series with the
first cell. Observe the brightness of each of
the bulb. Then connect one more dry cell in
series with the first two cells. Again observe
the bulbs.
Disconnect one of the three bulbs from
circuit. What do you observe? In series
connection of bulbs, if one bulb gets fused,
all the other bulbs in the series will stop
glowing. It means that if one bulb is
disconnected the other bulbs do not glow.
This can be observed in serial bulbs used in
decorative items at the time of marriages and
other festivals.
Connecting bulbs in parallel:
That is, one end of each of the three
bulbs are connected to one wire. The other
ends of the three bulbs are connected to
another wire. These two wires are connected
to a cell. All the three bulbs glow dimly. Now
disconnect one of the bulbs. What would
happen?
Can you predict? It means that if one
bulb is disconnected the other bulbs continue
to glow. This can be observed in our
household electric circuit. All components in
our houses are connected in parallel.
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