Stephen Smith AC concepts review 3
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Created by:
StephenSmith Plus on July 29, 2012
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20 terms
Terms | Definitions |
|---|---|
 Step up transformers | increase the voltage in the secondary winding, when compared to the primary winding |
| Step down transformers | Decrease the voltage in the secondary winding, compared to the primary winding |
| The transformer ratio of a transformer with primary voltage of 240v and a secondary voltage of 40 v is | 6 to 1 |
| The transformer ratio of a transformer with primary turns of 500 and secondary turns of 1250 | 1 to 2.5 |
| The secondary current will | be increased by four times |
| A danger tag placed on an electrical isolation device, may only be removed by | The person who placed it |
| The steps to isolate an electrical circuit are | Inform the customer, Identify the isolation device, Isolate the circuit, discharge stored energy, verify isolation, bond load side conductors to earth |
| The checks to be made before reconnecting supply to a circuit are | Check circuit continuity, check conductor terminal location, check terminal condition, check conductor condition, check circuit insulation resistance, check earth loop impedance. |
| The limited electrical licence of a refrigeration tradesperson allows him/her to complete the following work. | service and maintenance procedures on electrical circuits directly connected to refrigeration and air conditioning equipment, only. |
| Calculate the secondary current of a transformer with a ratio of 12 to 1 and a primary current of 10 amps. | 120 amps |
| Determine the secondary power consumed by a transformer that consumes 800 watts in the primary coil. | 800 watts |
| The secondary voltage being 20v. | 120 amps |
| Secondary power 480 watts. | 4 amps |
| Three types of circuit diagram are | schematic, wiring, block |
| Two sections of an electric circuit are | Control and power circuits |
| Two methods of connecting circuit components are | Series and parallel |
| Circuit loads are usually connected in parallel to ensure that | All loads are connected to full supply voltage |
| Switches in control circuits are commonly connected in series to ensure that | when any switch becomes open circuit, supply to the circuit load is disconnected. |
| Circuit loads are not connected in series because | Voltage drops across each circuit load in series, preventing loads from being connected to full supply voltage. |
| In a parallel circuit having 2 branches, load number 2 has a volt drop of 238 volts. Determine the supply voltage? | 238 volts |
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