Explain the colour code used to determine the value of carbon film resistors.

(N/A) The colour code for determining the resistance value of a carbon film resistor is provided in the table below:

Colour	Number	Multiplier	Tolerance $(\%)$
Black	$0$	$10^{0}$	-
Brown	$1$	$10^{1}$	-
Red	$2$	$10^{2}$	-
Orange	$3$	$10^{3}$	-
Yellow	$4$	$10^{4}$	-
Green	$5$	$10^{5}$	-
Blue	$6$	$10^{6}$	-
Violet	$7$	$10^{7}$	-
Gray	$8$	$10^{8}$	-
White	$9$	$10^{9}$	-
Gold	-	$10^{-1}$	$5\%$
Silver	-	$10^{-2}$	$10\%$
No Colour	-	-	$20\%$

To remember this code, use the mnemonic: "$B$ $B$ $ROY$ Great Britain Very Good Wife".
$1$. The first and second bands represent the first two significant digits of the resistance value.
$2$. The third band represents the decimal multiplier $(10^{n})$.
$3$. The fourth band represents the tolerance. If only three bands are present, the tolerance is $20\%$.
Example: For a resistor with Orange, Blue, Yellow, and Gold bands:
- Orange $= 3$, Blue $= 6$, Yellow $= 10^{4}$, Gold $= 5\%$.
- Resistance $= 36 \times 10^{4} \Omega \pm 5\%$.