Electricity Flashcards
What is current?
The flow of electric charge around a circuit
What is current measured in ?
Amps (A)
The current in a series circuit is ______ all the way through
the same
Which way does conventional current flow?
From positive to negative
Current and Potential Difference are d_______ p__________
directly proportional
What is the resistance like in an ohmic conductor?
It is constant it does not change as we increase the current
What is this current/potential difference graph for?
Ohmic conductor
What can affect the resistance of an ohmic conductor?
Temperature
The p.d. in a parallel circuit is ___ ____ in each component
the same
What is the total p.d across the components of a series circuit?
It adds up to the p.d. of the cell
Why does the temperature affect the resistance of a filament lamp?
When the filament heats up, its atoms gain more energy and move around faster meaning they collide with electrons in the current more often. This means that more energy is required to push the current through
Why isn’t a filament lamp an ohmic conductor?
Because the current through a filament lamp is not directly proportional to the resistance
Why isn’t the current and the resistance directly proportional in a filament lamp?
Because the filament heats up when a current flows through it, causing the resistance to increase
What current/resistance graph is this?
filament lamp
What current/resistance graph is this?
diode
