DC Circuits — Ohm's law, series, parallel
VCE Physics · Electricity & circuits · 6 flashcards, free to study.
Core formulas plus the 'why' behind series-current and parallel-voltage rules.
- Ohm's law
- V = IR (voltage in V, current in A, resistance in Ω).
- Resistors in series — total resistance
- R_total = R₁ + R₂ + R₃ ...
- Resistors in parallel — total resistance
- 1/R_total = 1/R₁ + 1/R₂ + ...
- Power dissipated in a resistor
- P = VI = I²R = V²/R.
- Why does current stay the same through series components?
- Charge is conserved — no junctions for it to split.
- What is EMF?
- Energy supplied per unit charge by a source. Equal to terminal voltage when no internal resistance loss.