Physics Electricity Flashcards
Why does adding more cells to a circuit make the bulbs brighter?
The current moves faster (not more charge) and its energy is emitted as light and heat energy.
Define current.
The rate of flow of charge
What is current measured in?
Amperes (A)
What does a circuit having a current of ‘3A’ mean?
3 coulombs of charge pass a point each second
Which side of the symbol for cell is positive?
The longer one
In a simple circuit, every point has the same Amp measurement. True or false?
True
The current get used up to produce light and heat. True or false?
False, the current is never used up
Why does charge move?
It is attracted to what is in front and repelled by what is behind
What happens to current at a junction?
The total current into a junction is equal to the total current leaving the junction
What is electric potential?
The amount of energy each coulomb of charge has at a particular point
If there is a potential difference between two points, what must happen to a coulomb of charge for it to move between the two?
It must either lose or gain energy.
What happens to the current if another cell is added to the circuit? Why?
There is a greater potential difference forcing the flow of current faster.
How does the type of energy change as it is transferred from the cell to the bulb?
Chemical - Electrostatic - Light
What is potential difference measured in?
Volts (V)
What is the sum of potential differences across the circuit equal to?
The sum of potential differences at the power supply.
