Electricity Flashcards
What is current
Rate of flow of charge
What direction does conventional current flow around a circuit
Charge flows from positive to negative, the opposite way from electron flow
What is the unit of charge
Coulomb ( C )
What is a coulomb
The amount of charge that passes in 1 second
What is potential difference
The work done (energy converted) per unit charge moved
What is the unit for potential difference
Volts or voltage ( V )
Where should a voltmeter be placed on a circuit
Should be connected in parallel with the component being measured
What is resistance
Resistance can be described as a force that counteracts the flow of current
What is resistance measured in
Ohms
What is ohms law
The amount of current is proportional to the voltage applied to the circuit and inversely proportional to the resistance of the circuit
What do I/V graphs show
Shows how the current flowing through a component changes as the potential difference across it is increased
What shape does a filament lamp provide on a iv graph
A curve that starts steep but gets shallower as the voltage rises
What are semi conductors
A material product with properties of both insulators and conductors
What are two examples of semi conductors
Thermistor
Diode
What is a thermistor
A resistor with a resistance that depends on its temperature,
Resistance decreases as the temperature increases.
