บทที่ 14 ไฟฟ้ากระแส

14 14.1 14.1 (electric current) 14.2 14.1.1 (free electron) () (drift velocity, ) 14.3

14.1.2 14.4 () (Ampere, ) 14.5 .7

14.2 14.2.1 14.8 ( ) (resistor) 14.9

fixed resistor) 14.10 14.1

variable resistor) 14.11 - (light dependent resistor : LDR) (light sensor) 14.12 (thermister) (temperature sensor) 14.13

(diode) (semiconductors) (forward bias) reverse bias) 14.14 14.15 14.2.2 ) (electrical resistivity) (strain gauge) (electrical conductance) ) electrical conductivity) ) 14.2.3 (insulator) (semiconductor) (conductor)

(superconductor) (critical temperature, ) (superconductivity) (high energy particles accelerators) (Maglev : Magnetic Levitation Trains) 513 14.3 14.16 14.3.1 (electromotive force, ) () 14.17

14.3.2 () electric power, ) 14.4 14.4.1 14.18 (series) (parallel) 14.4.2 14.19

14.20 14.5 14.6 14.21

14.22 14.23 (galvanometer) (digital multimeter) (multimeter) (analog multimeter) 14.6.1 (ammeter) (shunt) 14.24

14.6.2 (voltmeter) (multiplier) 14.25 14.6.3 (ohmmeter) ) 14.26

14.7 (UNIT) 1 =1 x 14.8 2 (neutral wire) (livewire) (earth ground) (voltage tester screwdriver) 14.27

14.8.1 (circuit breakers) () 14.28 14.8.2 14.8.3 short circuit)

14.29 14.30