END BASIC ELECTRICAL THEORY Basic Electricity

1 THE ATOM AND ITS STRUCTURE

2 CURRENT

3 THE FLOW OF ELECTRONS

4 VOLTAGE

5

6 Continuity Of The Electric Circuit

7 Elements in an electric clrcuit

8 OHM'S LAW

9 V I R Ohm’s law V = I x R I = V / R R = V / I

10 2 ohms How much current ? V IR V / R = I 12 / 2 = 6 amps 12V

11 SHORT CIRCUIT AND FUSES

12 ELECTRIC WIRES AND CABLES

13 Cable

14 RESISTORS

v v + V 24 volts 4v 12 volts Series With all the bulbs the same size each bulb will use 4 volts to push the current through it. Two batteries in series doubles the amount of cells so doubles the amount of voltage

16 12 volts V Parallel Two batteries in parallel increases the surface area of the plates in the battery so their combined output is increased Bulbs in parallel each bulb has its own supply and its own earth each bulb therefore uses 12 volts to push the current through it.

17 RESISTORS IN SERIES RESISTORS IN PARALLEL

18 RESISTIVITY

19 Resistance Variation Upon Temperature Variation

20 Rheostats And Potentiometers

21 ALTERNATOR

22 Capacitor / Condenser

23 Magnetic Effect Of The Electric Current

24 The right hand rule

25

26

27 Direct Current Electric Motor

28 DYNAMO

29 Semiconductor Materials DIODE

30 ZENER DIODE

31

32

33

34

35 Pressure Voltage Volts V Flow Current AmpsI Restriction ResistanceOhmsR PowerWatts W Electrical Terms