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⚡ CURRENT ELECTRICITY
:
DRIFT & OHM'S LAW
Part 1 — Drift of Charges
Part 2 — Ohm's Law
V
0 V
L
3.0 cm
E-Field ON
Thermal Motion
Net Drift
V
6.0 V
R
50 Ω
●
Electrons
(free in conductor)
~
Random thermal
motion
→
Net drift
(opposite to E)
Key insight:
Drift ≈ 0.1 mm/s
Yet current is
instantaneous!
●
Current flow
(+→)
●
Electrons
(−→)
—
V-I graph
(live)
Ohm's Law:
I = V / R
Slope of V-I
=
Resistance