Useful Circuits Flashcards
What are components connected by?
In a series in a line.
Where is the current the same?
All through the components connected in series.
The increases the potential difference?
The more cells connected in series.
What does the p.d. across the components add up to?
The p.d. across the battery:
Supply p.d. = p.d. across R1 + p.d. across R2 + p.d. across R3.
What is in proportion to its resistance?
The p.d. across each component.
What is the word equation for the overall resistance?
The sum of all the resistances: Rtotal = R1 + R2 + R3.
What is connected separately to the power supply?
The components in parallel.
What does the charge have?
A choice of pathways: current is shared between each branch.
What is the word equation for the sum of the current through all branches?
I total = I1 + I2 + I3.
How is the total resistance lower with two resistors than just one?
In parallel, more paths for charged to more along than either resistor on their own.
What is inversely proportional to its resistance?
The current through each resistor: largest through the component with the smallest resistance.
What is the work done by?
The power supply to provide energy to the charged particles: bulb uses energy to do work to provide heat and light: resistor uses the energy to do the work to provide the heat.
What must be equal to the work done by the circuit components?
In a series circuit, the work done on each unit of charge by the battery
- more work done is by the charge moving through a large resistance than through a small one
- two or more resistors have more resistance than one on its own: battery has to move through both of them
- change in resistance of one components will cause a change in the potential difference across all the components.
Cells is parallel have what similarity?
The potential difference as one cell on its own: amount of energy in the circuit will increase.
What is always the same in potential difference?
The p.d across components is the same and equal p.d of the battery.
