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20 terms

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