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NCCER ELECTRICAL MOD ULE 3
(INTRO TO ELECTRICAL
CIRCUITS) EXAM QUEST IONS
AND ANSWERS ALL VERIFIED
Question 1: A circuit has a source voltage of 50V and a
current of 10A, what is the power in watts?
CORRECT ANSWER: 500w
Question 2: Voltage is defined as the?
CORRECT ANSWER: driving force that makes current
flow in a circuit
Question 3: If a circuit has 12 amps of current and the
resistance is 20 ohms, the applied voltage is?
CORRECT ANSWER: 240 volts
Question 4: If two 10 ohm resistors are connected in
series, what is the total resistance of the resistors?
CORRECT ANSWER: 20 ohms
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Question 5: To make sure the voltage is turned off before
touching any terminals, use a?
CORRECT ANSWER: voltage tester
Question 6: How many amps are there in the current of a
circuit if the voltage source is 140V and the resistance is
- ohms?
CORRECT ANSWER: 70
Question 7: Materials with electrical characteristics that
fall between those of insulators and conductors are considered?
CORRECT ANSWER: semiconductors
Question 8: What is the applied voltage if the current in a
circuit is 60 amps and the resistance is 10 ohms?
CORRECT ANSWER: 600 volts
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Question 9: Which of the following is used to step voltage
down to lower levels before it reaches a home or office?
CORRECT ANSWER: transformers
Question 10: A 5 ohm and 20 ohm resistor are connected
in parallel, what is the total resistance of these two resistors?
CORRECT ANSWER: 4 ohms
Question 11: If the resistance of a circuit is 20 ohms and
the current is 10 amps, the power in watts is?
CORRECT ANSWER: 2500 watts
Question 12: If a circuit has 48 amps of current and
applied voltage of 240 volts, the resistance is?
CORRECT ANSWER: 50 ohms
Question 13: You would measure resistance with a?
CORRECT ANSWER: ohm meter
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Question 14: Which of the following substances is
considered a good semiconductor?
CORRECT ANSWER: silicon
Question 15: In a parallel circuit, the voltage drop?
CORRECT ANSWER: is the same across all loads
Question 16: An electron repels?
CORRECT ANSWER: other electrons
Question 17: Electric charge is measured in?
CORRECT ANSWER: Coulombs
Question 18: A mil is equal to?
CORRECT ANSWER: 0.001 inch
Question 19: A resistor has no further band, this indicates
that the resistor tolerance is?
