Electricity Review Questions

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Electricity Review Questions
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How are charges transferred through conduction?

• By Direct Contact

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How are charges transferred through induction?

• Charges in an uncharged metal object are
  rearranged without direct contact with a charged
  object.

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How are charges transferred through friction?

• Electrons are wiped from one object onto
  another.

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What is voltage?

• Voltage is a measure of how much work is needed
  to move a charge between two points.

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What is current?

• The amount of electricity flowing through a
  circuit.

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What is resistance?

• Resistance is the opposition presented to the
  current by a material or device. Will allow
  charges to flow, but they do not flow freely.

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What is the relationship between current and
resistance?

• Resistance increases, Current decreases
• Resistance decreases, Current increases

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What is the relationship between voltage and
current?

• Voltage increases, Current increases
• Voltage decreases, Current decreases

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What are the three parts of an electric circuit?

• Wire, Load, Energy Source

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What is electric discharge?

• The release of electricity stored in a source.

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What is static electricity?

• Electric charge at rest. Examples charged
  balloon, clothes stuck together from dryer

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What is a conductor?

• A material in which charges can move freely.

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What is an insulator?

• A material in which charges cannot move.

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Examples of conductors and insulators

• Conductors Iron, copper and other metals, water
• Insulators Glass, Wood, Plastic, Cotton

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What is a resistor?

• An object that supplies resistance in an
  electrical circuit.

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What is an electric field?

• The space around a charged object in which
  another charged object experiences an electric
  force.

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What is a fuse?

• A thin strip of metal that melts when too much
  current is flowing through it, creating an
  incomplete circuit.

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What is a circuit breaker?

• A switch that automatically opens if the current
  is too high.

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How can you increase the magnetic field in an
electromagnet or solenoid?

• Add more coils of wire or increase current.

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What is a series circuit?

• A circuit in which the parts are joined one after
  another so that the electricity has only one
  pathway.

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What is a parallel circuit?

• A circuit in which the parts are joined in
  branches, giving electricity more than one
  pathway.

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What are some advantages of a parallel circuit?

• If one load is missing or broken, charges will
  still flow through the other branches. You can
  use one light or appliance at a time.

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What types of circuits are used most often in
homes?

• Parallel

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What does a wire carrying electric current
produce?

• A magnetic field

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What is a solenoid?

• A coil of wire with an electric current in it.

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What is an electromagnet?

• A coil of wire that has an iron core and acts as
  a magnet when an electric current is in the coil.

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How do you make magnets using electricity?

• Make a coil of wire and send a current through it.

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How do you make electricity using a magnet?

• Move a magnet in and out of a coil of wire, or
  spin a coil of wire inside a magnet.

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What are some ways electromagnetism is used in
our daily lives?

• Electric Motors, Cars, Generators, Doorbells,
  Computers, Computer disks, Headphones, Cell
  Phones, Satellites, Television, Audio Recoding
  Devices, Speakers, Video Cassettes, Microphones

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What are four electrical safety tips?

• Make sure the insulation on cords is not worn.
• Do not overload circuits by plugging in too many
  electrical devices.
• Do not use electrical devices while your hands
  are wet or while you are standing in water.
• Never put objects other than a plug into an
  electrical outlet.