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?
Define 'potential difference'
The driving force that pushes the current around
What is the unit for potential difference?
Anything in the circuit which slows the flow (of the current) down
What is the unit for resistance?
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 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 ____
Charge is measured in ____
Time is measured in ____
More charge passes around the curcuit when a ____ current flows
More charge passes around the curcuit when a bigger current flows
A battery charger passes a current of 2.5 A through a cell over a period of 4 hours. How much charge does the charger transfer to the cell altogether?
Q = I x t = 2.5 x (4 x 60 x 60) = 36 000 C (36 kC)
Potential difference is the ____ ____ per ____ ____ ____
Potential difference is the work done per unit of charge
Give the formula for potential difference, work done, and coulombs
P.D. (V) = work done (W) / charge (Q)
Potential difference across an electrical component is...
... The amount of energy transferred by that electrical component (e.g. to light and heat energy by a bulb) per unit of charge