GCSE Physics (AQA)

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Sparks

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Electricity Static electricity

Sparks

2:01 Static Electricity and Electric Fields
Spec 4.2.5.1
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  • A charged object discharges when near or in contact with an Earthed conductor.
  • Example given: a Perspex rod charged by rubbing with a cloth discharges when in contact with a metal railing connected to the earth.
  • The charge flows through the railing to the earth, causing the rod to lose its charge.
  • Daily example: walking on a carpet can cause a static charge to build up.
  • Discharge occurs when touching a metal object like a doorknob, resulting in an electric shock.
  • Sparks can occur without direct contact; they are electric currents flowing through the air from a charged object to an Earthed conductor.
  • Sparks form when a strongly charged object is near an Earthed conductor, requiring a high potential difference for sparking.
  • Specific examples of sparking and discharging are not required for exams, but understanding the concept may be tested.

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