(3)Current - Voltage characteristics

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  • Created by: Olatunde
  • Created on: 25-03-14 13:22
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Current/Voltage characteristics.
Filament Lamp:
For a filament lamp, the graph curves because as the filament heats up, its resistance heats
up too. As voltage goes up, current decreases.
For a resistor current is directly proportional to the voltage.
Since current is only allowed in one direction through a diode, the graph will only be active on
either the positive or negative side.
If voltage increased enough, the diode conducts in other direction (Break down Voltage).

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Resistance decreases as temperature increases.
LDR ­ Light Dependent Resistor
Resistance decreases as light intensity increases.…read more

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Power is defined as the rate of transfer of energy. It is measured in watts (W), where 1W
= 1 joule per second i.e. P = E / t.
In electrical circuits: P = VI
This is because
1) Potential difference (V) is defined as the energy transferred per coulomb.
2) Current (I) is defined as the number of coulombs transferred per second
Therefore, p.d. x current is energy transferred per second i.e.…read more

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Electrical energy
Sometimes you may need to find the total energy transferred, for this power must be
multiplied by time
E = Pt so E = V*I*t (time is always in seconds)
If a question asks for energy without giving power, this is the equation which should be used.…read more


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