Stephen Smith AC concepts review 2
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Created by:
StephenSmith Plus on July 29, 2012
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20 terms
Terms | Definitions |
|---|---|
 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 |
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