Current and Potential Difference Flashcards
Define ‘current’
The flow of electric charge around the circuit
When will current only flow across a component?
If there is a potential difference across that component
What is the unit for current?
Ampere: A
Define ‘potential difference’
The driving force that pushes the current around
What is the unit for potential difference?
Volts: V
Define ‘resistance’
Anything in the circuit which slows the flow (of the current) down
What is the unit for resistance?
Ohm: Ω
The greater the resistance across a component, the ____ the current that flows
(for a given ____ ____ across the component)
The greater the resistance across a component, the smaller the current that flows
(for a given potential difference across the component)
Which 2 factors does total charge through a curcuit depend on?
- Current
- Time
Current is the ____ of ____ of ____
Current is the rate of flow of charge
Write the formula triangle for current, total charge, and time
Current = charge / time
Current is measured in ____
Amperes (A)
Charge is measured in ____
Coulombs (C)
Time is measured in ____
Seconds (s)
More charge passes around the curcuit when a ____ current flows
More charge passes around the curcuit when a bigger current flows
