CTS 1 EXAM: KEY AND LATEST A+ QUESTIONS AND ANSWERS

CTS 1 EXAM: KEY AND LATEST A+ QUESTIONS AND
ANSWERS
Image height for analytical decision making
IH = (IR x FV)/3438
Farthest viewer for analytical decision making
FV = IH/IR x 3438
dB formula - change in distance
20log(D1/D2)
dB formula - change in voltage
20log(V1/V2)
dB formula - change in power
10log(P1/P2)
Image height for basic viewing
IH = FV/(200 x %EH)
Farthest viewer for basic viewing
FV = IH x 200 x %EH
Farthest viewer given text height
FV = 200 x EH
Inverse Square Law: brightness
2 x Distance = 75% decrease in brightness
Inverse Square Law: surface area of light
2 x Distance = 4x surface area
Inverse Square Law: loudness
2 x Distance = -6dB
Ohm's Law
V=IR
Ohm's Law
P=IV
IPv4
32 bits, 4 billion unique addresses
IPv6