AC/DC SACA STUDY GUIDE
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT (GRADED A +)
How many degrees apart are the phases in a balanced three-phase system?
✔✔ Correct Answer: 120 degrees
Explanation: The three phases are evenly spaced by 120° to balance the electrical
load.
What information does an electrical schematic fail to show?
✔✔ Correct Answer: Physical connections
Explanation: Schematics represent electrical relationships and functions but don’t
depict the actual physical layout of wires or components.
In what units is resistance measured?
✔✔ Correct Answer: Ohms
Explanation: Resistance quantifies how much a material opposes electrical current
and is measured in ohms (Ω).
What is the formula to calculate electrical power?
✔✔ Correct Answer: P = I × E
Explanation: Power (P) is the product of current (I) and voltage (E).
In which units is electrical power expressed?
✔✔ Correct Answer: Watts
Explanation: Watts measure the rate of energy transfer or power in an electrical
circuit.
, What is the role of an inductor in a circuit?
✔✔ Correct Answer: It resists changes in current flow
Explanation: Inductors oppose rapid variations in current, storing energy in a
magnetic field.
A coil in a circuit acts as a __________.
✔✔ Correct Answer: Output
Explanation: Coils, such as those in relays or solenoids, are often part of output
devices that act upon signals.
Which of the following is classified as an output device?
✔✔ Correct Answer: Solenoid
Explanation: Solenoids convert electrical energy into mechanical motion, making
them outputs.
What formula is used to determine current?
✔✔ Correct Answer: I = E / R
Explanation: Current (I) equals voltage (E) divided by resistance (R), according to
Ohm’s Law.
During troubleshooting, if removing a branch from a parallel circuit does not
change the total resistance, what does this indicate?
✔✔ Correct Answer: The removed branch has an open circuit
Explanation: If the total resistance remains unchanged, the branch you removed
wasn’t conducting current, meaning it has a break or open.
The unit for electromotive force (emf) is? - ANSWERS✔✔Volt
What is the relationship of the applied voltage across two electrical components in
parallel with each other? - ANSWERS✔✔They are the same
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT (GRADED A +)
How many degrees apart are the phases in a balanced three-phase system?
✔✔ Correct Answer: 120 degrees
Explanation: The three phases are evenly spaced by 120° to balance the electrical
load.
What information does an electrical schematic fail to show?
✔✔ Correct Answer: Physical connections
Explanation: Schematics represent electrical relationships and functions but don’t
depict the actual physical layout of wires or components.
In what units is resistance measured?
✔✔ Correct Answer: Ohms
Explanation: Resistance quantifies how much a material opposes electrical current
and is measured in ohms (Ω).
What is the formula to calculate electrical power?
✔✔ Correct Answer: P = I × E
Explanation: Power (P) is the product of current (I) and voltage (E).
In which units is electrical power expressed?
✔✔ Correct Answer: Watts
Explanation: Watts measure the rate of energy transfer or power in an electrical
circuit.
, What is the role of an inductor in a circuit?
✔✔ Correct Answer: It resists changes in current flow
Explanation: Inductors oppose rapid variations in current, storing energy in a
magnetic field.
A coil in a circuit acts as a __________.
✔✔ Correct Answer: Output
Explanation: Coils, such as those in relays or solenoids, are often part of output
devices that act upon signals.
Which of the following is classified as an output device?
✔✔ Correct Answer: Solenoid
Explanation: Solenoids convert electrical energy into mechanical motion, making
them outputs.
What formula is used to determine current?
✔✔ Correct Answer: I = E / R
Explanation: Current (I) equals voltage (E) divided by resistance (R), according to
Ohm’s Law.
During troubleshooting, if removing a branch from a parallel circuit does not
change the total resistance, what does this indicate?
✔✔ Correct Answer: The removed branch has an open circuit
Explanation: If the total resistance remains unchanged, the branch you removed
wasn’t conducting current, meaning it has a break or open.
The unit for electromotive force (emf) is? - ANSWERS✔✔Volt
What is the relationship of the applied voltage across two electrical components in
parallel with each other? - ANSWERS✔✔They are the same
