ATT Comp Study Guide Updated 2025
This study guide aims to provide a structured format for exam revision,
covering key concepts and calculations.
I. Electrical Safety
Severity of Electric Shock:
o Primary factors: Current, path, duration.
o Not a primary factor: General health of the victim.
Current Levels:
o Severe muscular contractions: 12 milliamps (AC).
Circuit Protection:
o Capacitors: Not circuit protection devices.
Responding to Electric Shock:
o First action: Remove the victim from the source.
Fire Classification:
o Electrical fires: Class C.
Personal Protective Equipment (PPE):
o Sparks and debris: Safety goggles.
II. Powers of 10 and Metric Prefixes
Exponents:
o 1,000,000: 106
Scientific Notation:
o 770,000: 7.7×105
o 27000: 2.7×104
o 0.00003: 3×10−5
o 0.0000000053: 5.3×10−8
o 490000: 4.9×105
o 99,000,000: 9.9×107
, o 0.000066: 6.6×10−5
o 5 x 104: 50000
o 6.7 * 103: 6700
o 5.9 * 106: 5900000
o 3 x 10−3: 0.003
o 4.8 x 10−5: 0.000048
Metric Prefixes:
o 10000: 10 kilo
o 16 million: 16 Mega
o 32000: 32 kilo
o 0.000006: 6 micro
o 0.0034: 3.4 milli
o 1128: 1.128 kilo
o 6000: 6 kilo
o 44,000,000: 44 Mega
o 0.00003: 30 micro
o 2.88 kilos: 2880
Calculations with Powers of 10:
o 3.5×103+2.0×102=37×102
o 6×104−3×103=57×103
o 2×106×3×105=6×1011
o 5×104×2×10−2=10×102
o 12×104÷2×102=6×102
Metric Unit Calculations:
o 10K + 300: 10.3k
o 6k - 200: 5.8k
o 5k × 3m: 15
This study guide aims to provide a structured format for exam revision,
covering key concepts and calculations.
I. Electrical Safety
Severity of Electric Shock:
o Primary factors: Current, path, duration.
o Not a primary factor: General health of the victim.
Current Levels:
o Severe muscular contractions: 12 milliamps (AC).
Circuit Protection:
o Capacitors: Not circuit protection devices.
Responding to Electric Shock:
o First action: Remove the victim from the source.
Fire Classification:
o Electrical fires: Class C.
Personal Protective Equipment (PPE):
o Sparks and debris: Safety goggles.
II. Powers of 10 and Metric Prefixes
Exponents:
o 1,000,000: 106
Scientific Notation:
o 770,000: 7.7×105
o 27000: 2.7×104
o 0.00003: 3×10−5
o 0.0000000053: 5.3×10−8
o 490000: 4.9×105
o 99,000,000: 9.9×107
, o 0.000066: 6.6×10−5
o 5 x 104: 50000
o 6.7 * 103: 6700
o 5.9 * 106: 5900000
o 3 x 10−3: 0.003
o 4.8 x 10−5: 0.000048
Metric Prefixes:
o 10000: 10 kilo
o 16 million: 16 Mega
o 32000: 32 kilo
o 0.000006: 6 micro
o 0.0034: 3.4 milli
o 1128: 1.128 kilo
o 6000: 6 kilo
o 44,000,000: 44 Mega
o 0.00003: 30 micro
o 2.88 kilos: 2880
Calculations with Powers of 10:
o 3.5×103+2.0×102=37×102
o 6×104−3×103=57×103
o 2×106×3×105=6×1011
o 5×104×2×10−2=10×102
o 12×104÷2×102=6×102
Metric Unit Calculations:
o 10K + 300: 10.3k
o 6k - 200: 5.8k
o 5k × 3m: 15
