Basics
In S&C one of the most important equations is V = I x R
Voltage - (Also Potential Difference) The difference in energy levels between two points of a circuit. Measured in Volts (V).
I - Current - The number of electrons that pass a given point per second. Measured in Amps (A) (From Ampères).
Restistance - The measure of how good a substance is at conducting electricity. Measured in Ohms (Ω).
Good conductors of electricity (like copper and gold) have very low resistance (1-2 Ω), while insulators (like rubber and plastic) have a high resistance (several million Ohms).
Resistors
To get the value of the above resistor you put the brown or gold band on the right and read from left to right.
| Values | Zeros |
|Orange, Orange, White | Black |
3 3 9 = 339Ω
| Value | Colour | Zeroes |
|---|---|---|
| 0 | Black | |
| 1 | Brown | 0 |
| 2 | Red | 00 |
| 3 | Orange | 000 |
| 4 | Yellow | 0,000 |
| 5 | Green | 00,000 |
| 6 | Blue | 000,000 |
| 7 | Violet | 0,000,000 |
| 8 | Grey | 00,000,000 |
| 9 | White | 000,000,000 |
Component Symbols
Can you name all of the symbols below?
