electrical sources and internal resistance Flashcards
1
Q
What does EMF mean?
A
electromotive force of a source is the electrical energy supplied to each columb of charge which passes through the source
2
Q
What is internal resistance?
A
is the inherent resistance of the supply itself.
3
Q
What are the ‘lost volts’?
A
the voltage that will be used up in the overcoming the internal resistance of the supply
4
Q
What is t.p.d?
A
is the voltage across the terminals of the supply. This is the same as the voltage across
the load resistor.
5
Q
What is a short circuit?
A
is the maximum current that can be drawn from the supply Internal resistance is the negative gradient of a t.p.d. against current graph.
6
Q
What is an open circuit?
A
an electrical circuit that is not complete, switch is open or current is zero supply is equal to emf
