Resistance is the opposition to current flow in a circuit and is measured in ohms. It depends on a material's ability to allow electrons to pass through it, with conductors having low resistance and insulators having high resistance. Conductance is the opposite of resistance and measures a material's ability to allow current flow, with its unit being the siemens. Resistance and conductance are inversely related, as conductance is equal to the reciprocal of resistance.

1. Is opposition to current flow

2.  The opposition that limits the amount of
current that can be produced by the applied
voltage.
 It is a measure of how much an object
opposes the passage of electrons.

3. Conductors have very little resistance while insulators
have large amounts of resistance.
• The atoms of conductors have large amounts of free
electrons, which can be moved easily by a potential
difference.
• while atoms of insulators have few.

4.  The practical unit of resistance
 Named after the German physicist,
Georg Simon Ohm
 The symbol for resistance is R
 The abbreviation used for ohm unit is the
Greek letter omega, Ω
 In diagrams, resistance is indicated by a
zigzag line

5.  Opposite of resistance
 The ability for electricity to flow a certain
path
 Its symbol is G
 Its unit is Siemens ( S )
 Named after Ernst von Siemens
Fun fact: The old unit name for conductance is mho, which is ohm spelled
backwards!

6.  G is the reciprocal of R
Also

7. (a) (b)