Current, Potential Difference And Resistance Flashcards
In a circuit, what provides the voltage?
Power supply
Battery
Cell
In series circuits, the current flowing through each component is …?
The same
In series circuits, the total potential difference across the battery equals …?
The sum of the potential differences across the components
In parallel circuits, the total current through the whole circuit is the sum of …?
The current in each of the branches
In parallel circuits, the potential difference across components in parallel is …?
The same
All circuit components have …?
Resistance
What does resistance limit in a circuit?
The amount of current that is able to flow
There is a relationship that links resistance and voltage to …?
Current
Potential difference = ?
Current x resistance
V = ?
IR
What is the unit of potential difference?
The Volt
V
What is the unit of current?
The Ampere
A
What is the unit of resistance?
The Ohm
What does Ohm’s law state?
The current through a conductor is directly proportional to the potential difference across the conductor
The current and potential difference are linked by the components ________________
Resistance
What do ammeters measure?
The current flowing through components
Ammeters have low resistance.
True or False?
True
Ammeters are connected in parallel.
True or False?
False
They are connected in series
What do voltmeters measure?
The potential difference across a component
Voltmeters have low resistance.
True or False?
False.
They have high resistance
Voltmeters are connected in series.
True or False?
False
They are connected in parallel
Calculate the current when
Voltage = 3V Resistance = 1.5 ohms
2 A
Calculate the current when
Voltage = 360 mV Resistance = 2 ohms
0.18 A
Calculate the voltage when
Resistance = 37 ohms Current = 6.9 A
255.3 V
Calculate the resistance when
Current = 30 mA Voltage = 6 V
200 ohms
