Mapleham Study — Chapter 5

Chapter 5 — Key Takeaways

Unit Conversions — megahertz to kilohertz multiply or divide by 1000; milliamps to amps divide by 1000; picofarads to microfarads divide by 1 million
Conductors and Insulators — silver best conductor, copper most common, gold resists corrosion; glass, rubber, plastic, mica, ceramic are insulators
Ohm's Law and Power — E = I × R; P = E × I; use the triangle to find any unknown value
Series and Parallel Circuits — series total equals sum; parallel total uses reciprocal formula; same current in series, same voltage in parallel
Transformers and Power Ratings — secondary voltage over primary equals turns ratio; larger resistors have higher power rating
Decibel Power Ratios — doubling power adds 3 decibels; quadrupling adds 6 decibels; ten times adds 10 decibels; halving subtracts 3 decibels
Inductor and Capacitor Combinations — inductors add in series, reciprocal in parallel; capacitors behave opposite
Reactance — inductive reactance increases with frequency; capacitive reactance decreases with frequency
Resonance — inductive and capacitive reactance equal; parallel circuit gives maximum impedance; series gives minimum impedance
Measuring Instruments — voltmeter in parallel with high resistance; ammeter in series with low resistance; never connect ammeter in parallel