Electricty: Electrical Sources and Internal Resistance

Question 1

Electromotive Force ( EMF )

Answer 1

The energy supplied to each coulom of charge which passes through a source.

Question 2

Internal Resistance

Answer 2

The resistance that a power supple (or battery) has when current is flowing in a circuit.

Question 3

Lost Volts

Answer 3

The energy wasted inside an electrical source due to its internal resistance when current is drawn from the source

Question 4

Terminal Potential Differece (t.p.d.)

Answer 4

The voltage available at the terminals of an electrical source. That is, the voltage remaining after the lost volts has been subracted from the e.m.f.

Question 5

Ideal Supplies

Answer 5

A source with no internal resistance (i.e. it has only an e.m.f.)

Question 6

Short circuit Current

Answer 6

When the terminals of a battery or power supply are touched together or connected with a very low resistance wire, the current that flows is the short circuit current

Question 7

Open circuit

Answer 7

A circuit in which no current is flowing i.e. The swich is open

Question 8

How do you find the EMF from a graph

Answer 8

The y-intercept

Question 9

How do you find the internal resistance from a graph

Answer 9

The gradiant

Question 10

How do you find the short circuit current from a graph

Answer 10

The x-intercept