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25 Cards in this Set
- Front
- Back
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What is a series circuit?
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an electrical circuit that has only one path for electron flow
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What is a control circuit?
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A control circuit is an circuit that controls some major load in a system
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Safety devices in an electrical circuit are connected in------- with the load
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series
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How are series circuits used in air conditioning equipment?
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Series circuits are used as control circuits
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Why are series circuits used for most controlled circuits?
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When switches are wired in series with a load; If any switch opens, then the circuit will be open and the load de-energized. This is important, especially with safety controls.
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The current draw in a series circuit is........
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The same throughout the entire circuit
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The voltage drop of a series circuit is.........
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Proportional to the resistance in that part of the circuit
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How would switches used as safety devices be connected with respect to the loads they are protecting?
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series
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Draw a series circuit with a thermostat, a low pressure switch, and a high pressure switch used as safety controls to protect the motor
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refer to booklet
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Two identical 115 - volt light bulbs connected in series with 240 volts would.......
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burn correctly
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draw a circuit with 4 electric heaters in series
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refer to booklet
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What is a parallel circuit?
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An electrical circuit with more than one path of electron flow
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Parallel circuits are used in the air conditioning industry to..........
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supply the correct line voltage to several circuits
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Why are parallel circuits used in the air conditioning industry?
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to supply line voltage loads in equipment or a control circuit
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True or false: the current draw of a parallel circuit is the sum of the current of each branch circuit
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true
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If three circuits are connected in parallel with a power supply of 30 volts, what would be the voltage supplied to each circuit
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30 volts
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If two 115 volt loads were connected in parallel with 240 volts, they would.......
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immediately burn out
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What is a series - parallel circuit?
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a combination of series and parallel circuits
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Why are series - parallel control circuits important in the circuitry used in air conditioning equipment?
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In control circuitry, safety and operating controls must be wired in series while most loads must receive line voltage and must be wired in parallel
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Draw a series - parallel circuit with one switch controlling two electric heaters, each being supplied with line voltage.
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refer to booklet
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What is the resistance of a parallel circuit with the resistances of 2 ohms, 4 ohms, 6 ohms, and 10 ohms?
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1 ohm
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What is the resistance of a parallel circuit with resistances of 10 ohms and 20 ohms?
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6.67 ohms
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What is the total ampere draw of a parallel circuit with ampere readings of 2 amps, 7 amps, and 12 amps?
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21 amps
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What is the voltage of a series circuit with 4 voltage drops of 30 volts?
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120 volts
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What is the resistance of a series circuit with resistances of 4 ohms, 8 ohms, 12 ohms, and 22 ohms?
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46 ohms
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