# 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

Ohms

### EMF is an acronym for

Electro motive force

Volts

Volt meter

Clamp meter

De energised

Megger meter

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

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

Core and shell

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