Basic Electronics and Theory
concepts of energy and power, open and short circuits
What is the word used to describe how fast electrical energy is used?
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Current
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Correct AnswerPower
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Voltage
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Resistance
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If you have light bulbs marked 40 watts, 60 watts and 100 watts, which one will use electrical energy the fastest?
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They will all be the same
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The 40 watt bulb
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Correct AnswerThe 100 watt bulb
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The 60 watt bulb
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Which electrical circuit will have no current?
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A short circuit
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Correct AnswerAn open circuit
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A complete circuit
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A closed circuit
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Which electrical circuit uses too much current?
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A dead circuit
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Correct AnswerA short circuit
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A closed circuit
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An open circuit
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Which of the following two quantities should be multiplied together to find power?
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Inductance and capacitance
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Voltage and inductance
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Correct AnswerVoltage and current
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Resistance and capacitance
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Which two electrical units multiplied together give the unit "watts"?
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Volts and farads
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Farads and henrys
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Amperes and henrys
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Correct AnswerVolts and amperes
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A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much:
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voltage
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resistance
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current
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Correct Answerpower
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High power resistors are usually large with heavy leads. The size aids the operation of the resistor by:
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allowing higher voltage to be handled
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increasing the effective resistance of the resistor
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Correct Answerallowing heat to dissipate more readily
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making it shock proof
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The resistor that could dissipate the most heat would be marked:
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100 ohms
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2 ohms
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Correct Answer20 watts
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0.5 watt
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