Component characterisitics Flashcards
What is this the circuit symbol for and what does it do
How is it connected in a circuit?
This is an ammeter and it measures the current through a component.
It is connected in series with the component it is measuring
What component is this the graph of?
What does the graph tell you about the component?
This is an ohmic resistor
The graph shows that it has a constant resistance becuase it is a straight line.
Which component is this the V-I graph for?
What does the graph tell us about this component?
This is a graph for a filament lamp.
The graph shows that the resistance of the graph increases at a higher potential difference. This is shown becuase the flatter the gradient of the graph the higher the resistance.
The graph is flatter at a higher potential difference, so the resistance must be higher
Which component is this the graph of?
What does it tell us about the component?
This is the graph of a diode
It shows that a diode only allows the current to flow in one direction. It shows this becuase it has a high current when the potential difference flows in one direction and no current when the potential difference flows in the other direction.
What is this component called and what does it do?
This is a thermistor
The resistance goes down when it is heated up.
The resistance goes up when it is cooled
What is this component called and what does it do?
This is a lamp, it converts electrical energy into light energy
What is this component called and what does it do?
This is a fuse
It is a safety feature that breaks the circuit if the current gets too high
What is this component called and what does it do?
This is a light dependent resistor (LDR)
The resistance goes up when it is dark.
The resistance goes down when it is light
What is this component called and what does it do?
This is a switch.
It breaks the circuit to stop the current from flowing and completes the circuit to start the current flowing
What is this component called and what does it do?
This is a cell
It converts chemical potential energy into electrical potential energy
This makes the current move
What is this component called and what does it do?
This is a resistor
It slows down the current in the circuit
When it does this it converts electrical potential energy into thermal energy, so it gets hotter
What is this component called and what does it do?
This is a variable resistor
It allows a person to change the resistance of the resistor
What is this component called and what does it do?
This is a diode
It only allows current to flow in one direction
What happens to the potential difference in a circuit when cells are connected in series
Example: what is the total potential difference of these 3V cells?
The total potential difference is found by adding up the potential differences of each of the cells
Example: this battery contains 6 3V cells so the total potential difference is 6x3 = 18V
