3.1 Electrical Sources and Internal Resistance

Question 1

What is a power supply consistent of?

Answer 1

A source of emf plus a resistor in series

Question 2

What is electromotive force?

Answer 2

Energy supplied to each colourblind of charge passing through the supply

Question 3

What is lost volts?

Answer 3

Voltage lost from current flowing through the in ternary resistance

Question 4

What is terminal potential difference?

Answer 4

The maximum output voltage to the circuit

-emf minus the lost volts

Question 5

How do you find the emf of a source?

Answer 5

Measure the voltage across the supply in an open circuit

When there is no current flowing

Question 6

What is a short circuit?

Answer 6

When there is no external resistance (maximum current that will flow from a supply)

Question 7

What can be determined from voltage current graph with a negative gradient?

Answer 7

Y-intercept is the emf

Gradient is negative of internal resistance

Question 8

What can be determined from a voltage and 1/current graph with positive gradient?

Answer 8

Y-intercept is negative of internal resistance

Gradient is the emf