Current And Circuit Symbols Flashcards
What ‘s the unit of current
What is potential difference - what’s another name for it
Definition of resistance - what unit is it measured in
The current flowing through a component depends on ….
Unit of current = Ampere
Potential Difference (voltage) is the driving force that pushes the charge around. Unit = Volt
Resistance is anything that slows the flow down . Unit = Ohm
Current flowing through a component depends on the Potential Difference across it and the resistance of the component
Total charge through a circuit depends on .,
When a current flows past a point in a circuit for a length of time,then the charge is given by the formula ….
Total charge through a circuit depends on Current and Time
Q = it
Q= Charge flow (coulombs C). I = current (A) t = Time (s)
Describe the formula triangle for potential difference and current
What’s the formula linking pd and current
V
I. R
Potential difference (V) = Current (A) x Resistance
Give some factors that the resistance if a circuit can depend on
- Whether components are in series or parallel
- length of wire used in circuit
What’s an Ammeter
How should the Ammeter be placed
Measures current (in amps) flowing through test wire
Ammeter must always be placed in series with whatever investigating
What does Voltmeter do
How should Voltmeter meter be placed
- measures the potential difference (or pd) across test wire (in volts)
- voltmeter must always be placed in parallel around whatever is being investigated - not around any other bit if circuit
