Reading the notation

A small set of symbols carries every part of this paper — get them precise, since a mixed-up V, I and R is the fastest way to lose a method mark.

7 terms

Cover the right column and check you can say what each one means.

V, I, R: Voltage (V), current (A), resistance (Ω) — related by V = IR.
P: Power (W) — P = VI = I²R = V²/R, chosen by whichever two quantities you already have.
ε, r: EMF (V), the cell's total energy per coulomb, and internal resistance (Ω) — terminal voltage V = ε − Ir.
B: Magnetic field strength (T, tesla).
F = BIL: The force on a current-carrying wire in a magnetic field, perpendicular to both — found with the left-hand motor rule.
Faraday's law: A CHANGING field or flux through a circuit induces an EMF — no change, no EMF.
Lenz's law: The induced current opposes the change that caused it.

Practice for this standard covers the whole topic — flashcards and quiz.