1.9 Current, Charge, pd and emf Flashcards
What is another name for free electrons?
Charge carriers
What is conventional current?
The flow of current that is opposite to the flow of electrons. It is not real. It flows from the positive terminal to the negative terminal.
How do electrons flow?
From the negative terminal to the positive terminal. Opposite to conventional current.
What is the definition of electric current?
Charge passing a point in 1 second/ rate of flow of charge.
What is the definition of potential difference?
Energy transferred from electrical to other forms when unit charge passes through it.
What is the definition of electromotive force?
Energy converted from other forms to electrical energy when unit charge passes through it.
What is the definition of a volt?
One joule of energy is dissipated per unit charge (1C).
What is EMF?
The amount of electrical energy produced per coulomb of charge passing through the source (volts).
What is a summary of EMF?
Electrical energy produced per unit charge. Producing electrical energy.
What is a summary of p.d.?
Electrical energy transferred per unit charge. Using electrical energy.
What happens when there is no load/open circuit?
No current is flowing through the circuit so terminal p.d. = emf.
What happens when a circuit has a load?
Current flows through the circuit so terminal p.d. doesn’t = emf.
There is voltage lost in internal resistance of the cell.
