Summary Electric Circuits Grade 12 Physical Science
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Course
Physical Sciences
Institution
12th Grade
These notes are provide detailed information on the electric circuits chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Chapter 10
{ Circuits } (class notes)
Power = measured in Watt
P =
𝑾
Δ𝒕
SWITCH OPEN P = VI
P = I 2R
𝑽2
P = 𝑹
Power in Series &
Parallel circuits
Power of bulb = ‘brightness’
o No current flows
o Voltmeter reads emf
SERIES
➢ Blue = internal circuit
➢ Purple = external circuit
Current = same (constant)
SWITCH CLOSED ➢ P = I2R
➢ ∴P ∝ R
PARALLEL
o Current flows Voltage = same (constant)
𝑽2
o Voltmeter reads voltage to external ➢ P =
circuit (Vex) 𝑹
𝟏
o Voltmeter reading drops bcz ➢ ∴P ∝
𝑹
internal resistance of cells
o ∴ V = lost (Vlost/Vint) – 0,5V is
lost
Energy = required to move charges
REMEMBER:
through cells (w/ resistance) Series
Emf = Vex + Vint • Current = same
3V = 2,5V + 0,5V • Voltage = split
* Vint x measured by voltmeter *
• Resistance incr
E = I(R + r)
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