Chapter 9 and 10

Question 1

What is one volt

Answer 1

When 1 joule of energy is transferred per coulomb of charge

1V = 1J C^-1

Question 2

Difference between electromotive force and voltage

Answer 2

Voltage is when work is done by the charge carriers, e.m.f is when work is done on the charge carriers

Question 3

Explain how an electron gun functions

Answer 3

A potential difference is ran through a filament which heats up.
Electrons in the filament can then be emitted when they have enough energy through thermionic emission.
They are attracted towards an anode in a vacuum with a small hole and if they are of the right angle they can be fired in a small beam.

Question 4

Equation and assumption behind an electron gun

Answer 4

W = VQ
W = eV
eV = 0.5 x m x v²

Assuming that initial kinetic energy of electron is 0 and no energy is lost to surroindings

Question 5

What is resistance

Answer 5

Opposition to the flow of charge, defined as one volt divided by one ampere

Question 6

How to determine resistance

Answer 6

Using a circuit with a component, voltmeter in parallel, ammeter in series, and a variable power supply.

Question 7

Ohms law

Answer 7

For a metallic conductor, at constant temperature, the current is directly proportional to its potential difference

Question 8

IV graph for diode, thermistor, filament lamp, resistor

Answer 8

Diode - Exponentional graph looking ahh
Filament lamp - S shape
Thermistor - inverse of filament
fixed resistor - straight line