Circuit Components And Current-Voltage Graphs Flashcards
To learn about circuit components and the characteristics of various graphs
What is the resistance when:
Potential difference=230V
Current=7A
32.9 Ohms
Why does a diode need a resistor placed in series?
To prevent a high current from damaging it
What pattern is shown by the graph of a filament graph?
As the voltage increased, the current increased at a slowing rate
What pattern is shown by the graph of a diode?
As voltage increases, the current increased at an increasing rate
In a metal there are ____________ electrons that can move through the material when connected to a voltage. The _______ electrons move between the _________ ions that make up the rest of the metal
Delocalised
Free
Positive
The resistance will be affected by the ____________ and ______________ of the positive metal ions.
Spacing
Vibration
What are the 4 factors that affect the resistance of a wire?
Material
Length
Cross-sectional area
Temperature
What are current voltage graphs also known as?
I-V graphs
In I-V graphs, we plot current on the ___-axis and voltage on the ___-axis.
Y
X
How are current-voltage graphs useful?
They are useful for comparing the behaviour of circuit components
If a graph is a straight line through the origin, the resistance is the _________ of the ___________.
If not, resistance is found for a point on a line by finding the _________ reading and dividing it by the _________ reading.
Inverse
Gradient
Voltage
Current
An LED allows current to flow any direction
True or False?
False
A hot wire has _________ resistance as it is __________ for electrons to pass through it
Greater
Harder
Filament lamp allows current to flow in both directions
True or False?
True
What are the advantages of LED’s?
Long lifetime
More robust
Switch on quickly
More efficient