HVAC EXCELLENCE - ELECTRICITY EXAM QUESTION AND
ANSWERS
Current flow is: CORRECT ANSWERS✓✓The flow of electrons in the circuit.
Impedance is: CORRECT ANSWERS✓✓Opposition to alternating current flow.
Like charges; CORRECT ANSWERS✓✓repel each other.
Any material that will readily release electrons is called; CORRECT ANSWERS✓✓A conductor
The symbol for current is; CORRECT ANSWERS✓✓I
Which of the following materials would be best suited for use as a semi-conductor? CORRECT
ANSWERS✓✓silicon
The safety ground conductor is usually color coded; CORRECT ANSWERS✓✓green or bare.
An electron has; CORRECT ANSWERS✓✓a negative charge.
Resistance is: CORRECT ANSWERS✓✓Opposition to current flow.
How many watts of power are used by a heater operating at 240 volts and drawing 5 amps? CORRECT
ANSWERS✓✓1200 watts
Which of the following meters must use its internal power to check a load or circuit? CORRECT
ANSWERS✓✓Ohmmeter
In electrical wiring, a black colored wire in an alternating current circuit usually indicates; CORRECT
ANSWERS✓✓the hot conductor.
, Fuses are sized by: CORRECT ANSWERS✓✓Volts & Amps
What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in series with a 24
volt, 200-ohm control relay coil? CORRECT ANSWERS✓✓Only the control relay would operate.
Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power supply. How many watts
of power will be used? CORRECT ANSWERS✓✓2880 Watts
Which of the following is generally considered to be within the maximum allowable (plus or minus)
supply voltage variation? CORRECT ANSWERS✓✓5%
Capacitors are rated in CORRECT ANSWERS✓✓Microfarads & Volts.
When testing a capacitor with an analog or digital ohmmeter, the meter should; CORRECT
ANSWERS✓✓measure low resistance then return to high reading.
What is the term used to describe the output side of a transformer? CORRECT ANSWERS✓✓Secondary
side.
One horsepower is equal to __________ watts. CORRECT ANSWERS✓✓746
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps?
CORRECT ANSWERS✓✓60 Ohms
A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; CORRECT
ANSWERS✓✓6 ohms.
In a series circuit, the voltage drop across each resistance (load) will. CORRECT ANSWERS✓✓add up to
equal the source voltage.
ANSWERS
Current flow is: CORRECT ANSWERS✓✓The flow of electrons in the circuit.
Impedance is: CORRECT ANSWERS✓✓Opposition to alternating current flow.
Like charges; CORRECT ANSWERS✓✓repel each other.
Any material that will readily release electrons is called; CORRECT ANSWERS✓✓A conductor
The symbol for current is; CORRECT ANSWERS✓✓I
Which of the following materials would be best suited for use as a semi-conductor? CORRECT
ANSWERS✓✓silicon
The safety ground conductor is usually color coded; CORRECT ANSWERS✓✓green or bare.
An electron has; CORRECT ANSWERS✓✓a negative charge.
Resistance is: CORRECT ANSWERS✓✓Opposition to current flow.
How many watts of power are used by a heater operating at 240 volts and drawing 5 amps? CORRECT
ANSWERS✓✓1200 watts
Which of the following meters must use its internal power to check a load or circuit? CORRECT
ANSWERS✓✓Ohmmeter
In electrical wiring, a black colored wire in an alternating current circuit usually indicates; CORRECT
ANSWERS✓✓the hot conductor.
, Fuses are sized by: CORRECT ANSWERS✓✓Volts & Amps
What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in series with a 24
volt, 200-ohm control relay coil? CORRECT ANSWERS✓✓Only the control relay would operate.
Three defrost heaters, each 15 ohms are wired in parallel to a 120 volt power supply. How many watts
of power will be used? CORRECT ANSWERS✓✓2880 Watts
Which of the following is generally considered to be within the maximum allowable (plus or minus)
supply voltage variation? CORRECT ANSWERS✓✓5%
Capacitors are rated in CORRECT ANSWERS✓✓Microfarads & Volts.
When testing a capacitor with an analog or digital ohmmeter, the meter should; CORRECT
ANSWERS✓✓measure low resistance then return to high reading.
What is the term used to describe the output side of a transformer? CORRECT ANSWERS✓✓Secondary
side.
One horsepower is equal to __________ watts. CORRECT ANSWERS✓✓746
How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps?
CORRECT ANSWERS✓✓60 Ohms
A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; CORRECT
ANSWERS✓✓6 ohms.
In a series circuit, the voltage drop across each resistance (load) will. CORRECT ANSWERS✓✓add up to
equal the source voltage.
