**terminology, concepts and equations:**

current, I, is flow of charged particles.

potential difference, V, is energy per unit charge.

resistance is caused by electrons colliding with other electrons and particles.

conductance is how much an electrical component carries an electircal current.

IN SERIES, total R = R1 + R2 + R3 + ...

IN PARALLEL, total G = G1 + G2 + G3 + ...

emf is pd across a cell.

Ohm's law is that V = IR, and for potential dividers V2 = V(total in) x R2/(R1+R2).

load resistance is resistance across a power source.

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