harmonics

What is the fundamental frequency

• 50hz

• 60hz

• 100hz

• 150hz

What is the 4th harmonic

(a)  

What Is a harmonic

• Sinewave

• Ripple

• Distorted sinewave

• Square wave

Signs of harmonics include

• Smoke

• Heat

• Noise

• Smell

which electrical equipment is mostly likely to cause harmonics

• induction motor

• alternator

• variable frequency drive

• inverter

what is resonance

• Xl=Xc

• Xl=R

• Xc=R

• Z=R

what is common to install in a circuit with odd harmonics

• a smaller neutral

• a larger neutral

• no neutral

• earth

harmonics can be reduced by

• inverters

• filters

• regulators

• shields

in a series circuit at resonance if circuit impedance is at a minimum what is at a maximum

(a)  

ripple control blocking inductors are connected

• in series with capacitors

• in parallel with inductors

• in series with a load

• in parallel with a voltmeter