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20 terms

Stephen Smith AC concepts review 2

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The time period of an AC supply is
The time in seconds taken to complete one cycle or one sine wave
The frequency of an AC supply is
The number of cycles or sine waves completed in one second
The frequency of an AC supply equals
1 divided by the time period T of the sine wave
The time period of an AC supply equals
1 divided by the frequency F of the sine wave
The Impedance value of an AC circuit is the sum of which of the following values?
Resistance, inductive reactance and capacitive reactance
Resistance, inductive reactance and capacitive reactance are all measured in
Ohms
EMF is an acronym for
Electro motive force
EMF is measured in
Volts
EMF is measured using an
Volt meter
Current in an AC circuit is most commonly measured using an
Clamp meter
When measuring the resistance value of a circuit or circuit components, the circuit must be
De energised
The instrument used to measure the insulkation resistance of a circuit or circuit components, is a
Megger meter
The minimum acceptable value in megger ohms, for insulation resistance of a circuit is
1 megger ohm
Before using an electrical measuring instrument to measure electrical quantities of a circuit
the operation must be verified on a known live source
Four common waveforms used to graphically display an electrical supply are
DC, Sine, Square, Triangle
Current in a DC circuit
Constantly flows in one direction
Current in a AC circuit
Constantly changes direction of flow
Current is caused to flow in the secondary winding of a transformer due to what electrical principle?
Mutual induction
The magnetic field developed in the primary winding of a transformer cuts across the secondary winding causing
a current to flow in the secondary winding
the names of the two types of transformer construction are
Core and shell