Different Circuits

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Different Circuits

• Topic 3 Physical Science
• Pages 314-323

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• Different circuit types let you control how
  electricity works!

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How Can You Light Two Bulbs with One Cell?

• A circuit in which the current must flow through
  one bulb in order to flow through the other is a

SERIES CIRCUIT.
When both bulbs are in place in a series circuit,
it is a closed circuit. When one bulb is
removed, an open circuit is created.
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• A circuit in which each bulb is connected to the
  cell separately is a

PARALLEL CIRCUIT.
When one bulb is removed from a parallel circuit,
the other bulb is still a part of a complete
circuit. That is why it remains lit.
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Series and Parallel
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Why Are Bulbs Brighter in a Parallel Circuit than
in a Series Circuit?

• A series circuit is like a road. Each
  construction area narrowing the road acts like a
  resistor in a circuit. Cars traveling along this
  road would be slowed down as they passed each
  resistor, or construction site.

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• In a parallel circuit there are two paths along
  which current can flow. It is like a split road.
  Each section of road has only one resistor.
  More cars can travel along this road, just as
  more current can flow through a parallel circuit.

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What Types of Circuits Are Found in Homes and
Other Places?

• Electrical devices in homes and other places are
  connected in parallel circuits. If they were
  series circuits all the lights would go out if
  one bulb burnt out. Circuits are controlled by
  like the light switch on the
  wall that opens and closes a circuit.

SWITCHES
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How Can Circuits in Homes Be Protected?

• One device that keeps too much electrical current
  from flowing through wires is called a

FUSE.
Most newer homes are built with a It is a switch
that protects circuits from dangerously high
currents.
CIRCUIT BREAKER.
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Circuit Boxes and Circuit Breakers