Unit 36 Flash Cards

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unknown JTL Unit 36 and 38 Revision Flashcards on Unit 36 Flash Cards, created by giannini.chambers on 22/04/2015.
giannini.chambers
Flashcards by giannini.chambers, updated more than 1 year ago
giannini.chambers
Created by giannini.chambers about 9 years ago
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Question Answer
Illuminance below a light source I/d²
Illuminance at an angle from a light source cos(θ) x I _____________ d²
Ohm's Law V=IxR
Resistive Power P=VxI P=I²R P=V²/R
3 phase True Power P=√3 x VL x IL x cos(θ)
3 phase apparent power S=√3 x VL x IL
Symbol for Inductance L
Symbol for Capacitance C
Symbol for Resistance R
Symbol for Inductive Reactance XL
Symbol for Capacitive Reactance XC
Equation for Inductive Reactance 2πfL
Equation for Capacitive Reactance 1/(2πfC)
Equation for Impedance Z=√(R²+(Xl-Xc)²)
The names of 8 types of protective device FUSE MCB MCCB RCBO RCD ACB VCB OCB
Typical Generation Voltage 22/25kV
Typical Transmission Voltages 132kV/275kV/400kV
Typical Distribution Voltages 33kV/11kV
Equation for Star Voltage VL=VP x √3
Equation for Star Current IL=Ip
Equation for Delta Voltage VL=Vp
Equation for Delta Current IL=Ip x √3
What value is the SI prefix µ x10^-6
What value is the SI prefix m x10^-3
What value is the SI prefix k x10^3
What value is the SI prefix M x10^6
What value is the SI prefix n x10^-9
What value is the SI prefix p x10^-12
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