Summary
Electric Circuits Summary
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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ELECTRICCIRCUITS
, 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 + measu
ohms.
• If too much current flowing in a circuit- can lead to fuse so resistors are added to mitiga
, 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
, RESISTORS IN SERIES
• Total effective resistance = sum of the separate resistors in circuits
• Each resistor (nvm the size of it) in a series circuit gets the same current strength
IE: I = I =I
• HOWEVER, total potential difference of external circuit → resistors in series are
potential dividers
IE: V = V + V + V
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