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Slide 1

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Resistance
Resistance is anything that will
RESIST a current. It is measured
in Ohms, a unit named after me.
Georg Simon Ohm
1789-1854
The resistance of a component can be
calculated using Ohm's Law:
V
Resistance = Voltage (in V)
(in ) Current (in A)
I R…read more

Slide 2

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Current-voltage graphs
I I
2. Bulb
V V
I
1. Resistor 3. Diode
V
Explain the shape of each graph…read more

Slide 3

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Three simple components:
1) Diode ­ only lets current flow in one direction
2) Light dependant resistor ­ resistance DECREASES when
light intensity INCREASES
3) Thermistor ­ resistance DECREASES when temperature
INCREASES…read more

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