Study TipsMay 20, 20266 min read
MDCAT Current Electricity 2026 — Highest-Yield Physics Chapter
Premeth Team
Meth Experts
Current Electricity yields 4–5 of the 36 MDCAT Physics MCQs (~12% of the Physics section). Highest-density Physics chapter by MCQ count.
- Estimated MCQs — 4–5 of 36 Physics
- Core formulas — V = IR, P = VI, R = ρL/A
- Kirchhoff — KCL (junction), KVL (loop)
Source: PMDC MDCAT 2026 syllabus.
Core Formulas
- Ohm's law — V = IR
- Power — P = VI = I²R = V²/R
- Resistance — R = ρL/A (resistivity, length, area)
- Drift velocity — I = nAevd
Resistors
- Series — Rtotal = R1 + R2 + ...
- Parallel — 1/Rtotal = 1/R1 + 1/R2 + ...
- Two resistors in parallel — Req = R1R2/(R1+R2)
Kirchhoff's Rules
- KCL (current law) — sum of currents into a junction = sum of currents out (conservation of charge).
- KVL (voltage law) — sum of EMFs around a loop = sum of IR drops (conservation of energy).
FAQ
Q: EMF vs terminal voltage?
EMF (ε) is the no-current voltage; terminal voltage V = ε − Ir (internal resistance drop).
Q: Wheatstone bridge balance condition?
P/Q = R/S (when galvanometer reads zero).
Pair with our complete Physics formula sheet.
Related Tags
#MDCAT#Physics#Current Electricity#Circuits
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