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Electric Circuits Summary

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15 pages
2022/2023 Written for academic year
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12th Grade
Course
Physical Sciences
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A recap or summary of electric circuits for grade 12 learners suitable for both IEB and CAPS. It includes theory and revision questions for revision purposes.

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ELECTRIC
CIRCUITS

, Strength of electric current (I)
 Emf of the battery
 Electrical potential difference (V)
 Electrical resistance


• Ammeter:
• measure current strength through a resistor
• connected in series with resistor
• Has low resistance

• Voltmeter:
• Measure the potential difference across the ends of a resistor
• Connected in parallel across a resistor
• Has high resistance

• Resistance→ a measure of the opposition to current flow in an electrical circuit + measured in
ohms.
• If too much current flowing in a circuit- can lead to fuse so resistors are added to mitigate it.

, OHMS LAW
• Definition: the potential difference across a resistor is directly proportional to the
current strength through the resistor, provided that the temperature remains
constant.




• R = V/I
• V = IR (external resistance)
• I = V/R
Connected book
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Karin H. Kelder, Derick Govender, Jagathesan Govender Physical Sciences, Grade 12
Publisher: 2013 ISBN: 9781107629394 Edition: Unknown

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Electric circuits
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2022/2023
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Summary
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Browse related subjects

Subjects

  • electric
  • circuits
  • electric circuits
  • emf
  • potential difference
  • electrical resistance
  • ammeter
  • current strength
  • current
  • voltmeter
  • resistors in series
  • resistors in paralell
  • internal re
  • battery
  • ohms law

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