OHM'S LAW
PUSH · FLOW · RESISTANCE
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The Circuit
+
−
A
bulb
● electrons
V =
voltage (push)
I =
current (flow)
R =
resistance
1. Ohm's Law
V = I R
I = V / R =
at constant temperature
V – I GRAPH
I
V
slope = R
2. Units
V
→ volt (V)
I
→ ampere (A)
R
→ ohm (Ω)
1 Ω = 1 V / 1 A
3. Remember
Increase V → I increases
Increase R → I decreases
MATRIC PHYSICS · CURRENT ELECTRICITY · PUNJAB BOARDS
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