Voltage, Current and Resistance – 18

Yellow: 4
Violet: 7
Red: 2
Silver: 10% tolerance.

Resistor is : 47 * 10^2 = 4,700 ohm.

BLACK: 0
BROWN: 1
RED: 2
ORANGE: 3
YELLOW: 4
GREEN: 5
BLUE: 6
VIOLET: 7
GREY: 8
WHITE: 9

GOLD: 5% (tolerance)
SILVER: 10%  (tolerance)
NO COLOUR: 20% (tolerance)

The first band gives the first digit.
The second band gives the second digit.
The third band indicates the number of zeros.
The fourth band is used to shows the tolerance (precision) of the resistor.

Short trick of colour bands:
B B R O Y G B V G W.
BB ROY GO BOMBAY VIA GATE WAY.
(B- Black – 0, B – Brwon – 1, R – Red – 3, O – Orange – 4, Y – Yellow – 5, G – Green – 6, B – Blue – 7, V – Violet – 8, G – Gray – 9, W – white – 10) [#Gold =5% #Silver= 10% #No colour = 20%]