Charge Flashcards
Voltage
Work done in joules/
Charge (in coulombs)
What do the polythene and perspex represent?
Polythene and Perspex strips represented negative charges and positive charges, and the strips would need to be placed against the opposite pivot, in order to move the pivot.
What is potential difference?
The potential difference V between 2 points in a circuit (ie. the difference in potential energy) is equal to then energy used/ work done W to move each coulomb of charge Q between the points
What is current?
Current is the flow of charge.
How do you obtain current?
A source of potential difference and a conductor of charge connecting the two different points.
What is the strength dependent on?
On potential difference and resistance offered by the conductor of charge.
Both negative and positive charges can flow in ______ but not in _____.
Gases
Metals
What is current measured with?
Using an ammeter and is measured in units of amperes.
What is convential current?
Movement of electrons from positive terminal to negative terminal
What is a rheostat?
A variable resistor
Ohm’s Law
The current in a current carrying conductor is directly proportional to the voltage across that conductor and inversely proportional.
