Basic Electrical Circuits
1. For safety, how frequently should backup batteries in devices like fire
alarms typically be replaced?
Every 6 months or so
2. Define the electrical quantity that represents the force driving the
movement of electrons.
Voltage
3. What type of electrical current is characterized by a flow in only one
direction?
Direct
4. Describe the motion produced by a solenoid, an output device, when an
electrical current is applied to it.
Linear
5. What electrical property do Ohms measure?
Resistance
6. Identify the tool used to detect the presence of AC electricity.
Circuit tester
7. What category of switches requires human interaction to control the flow of
power to outputs?
Manual
8. Provide an example of a switch that does not rely on manual operation.
Pushbutton
Selector
Knife
,9. What is the primary function of a switch within an electrical circuit?
Energize and de-energize circuits
10. Outline the key functions of a power supply in an electrical circuit.
Regulate voltage or current
Create smooth output voltage or current
Prevent an overload
11. What term describes a pushbutton switch that incorporates a return
spring mechanism?
Momentary
12. What is the standard unit of measurement for electrical current?
Amp
13. Describe the characteristics of an electrical circuit that allows current to
flow continuously between the positive and negative terminals of a power
supply.
Closed
14. What type of diagram utilizes symbols to illustrate electrical components
and their interconnections within a circuit?
Schematic
Basic Electrical Circuits - Further Elaboration
15. What is the fundamental particle responsible for electrical current in a
conductor?
Electron
16. Define the term "circuit" in the context of electricity.
A closed loop that allows electric current to flow.
, 17. What is the relationship between voltage, current, and resistance in an
electrical circuit, as described by Ohm's Law?
Voltage (V) is directly proportional to current (I) and resistance (R),
expressed as V=IR.
18. If a circuit has a voltage of 12V and a resistance of 4Ω, what is the current
flowing through it?
3 Amps (using I=V/R)
19. What unit is used to measure electrical power?
Watt (W)
20. How is power calculated in a DC circuit?
Power (P) is the product of voltage (V) and current (I), expressed as P=VI.
21. If a device draws 2 Amps of current at 10V, what is its power
consumption?
20 Watts
22. What is the purpose of a fuse in an electrical circuit?
To protect the circuit from overcurrent by melting and breaking the circuit.
23. What is the function of a circuit breaker?
To protect a circuit from overcurrent by tripping and interrupting the current
flow, and it can be reset.
24. What is the difference between AC and DC electricity?
AC (Alternating Current) periodically reverses direction, while DC (Direct
Current) flows in one direction only.
25. What is the standard AC frequency in many parts of the world?
50 Hz or 60 Hz
1. For safety, how frequently should backup batteries in devices like fire
alarms typically be replaced?
Every 6 months or so
2. Define the electrical quantity that represents the force driving the
movement of electrons.
Voltage
3. What type of electrical current is characterized by a flow in only one
direction?
Direct
4. Describe the motion produced by a solenoid, an output device, when an
electrical current is applied to it.
Linear
5. What electrical property do Ohms measure?
Resistance
6. Identify the tool used to detect the presence of AC electricity.
Circuit tester
7. What category of switches requires human interaction to control the flow of
power to outputs?
Manual
8. Provide an example of a switch that does not rely on manual operation.
Pushbutton
Selector
Knife
,9. What is the primary function of a switch within an electrical circuit?
Energize and de-energize circuits
10. Outline the key functions of a power supply in an electrical circuit.
Regulate voltage or current
Create smooth output voltage or current
Prevent an overload
11. What term describes a pushbutton switch that incorporates a return
spring mechanism?
Momentary
12. What is the standard unit of measurement for electrical current?
Amp
13. Describe the characteristics of an electrical circuit that allows current to
flow continuously between the positive and negative terminals of a power
supply.
Closed
14. What type of diagram utilizes symbols to illustrate electrical components
and their interconnections within a circuit?
Schematic
Basic Electrical Circuits - Further Elaboration
15. What is the fundamental particle responsible for electrical current in a
conductor?
Electron
16. Define the term "circuit" in the context of electricity.
A closed loop that allows electric current to flow.
, 17. What is the relationship between voltage, current, and resistance in an
electrical circuit, as described by Ohm's Law?
Voltage (V) is directly proportional to current (I) and resistance (R),
expressed as V=IR.
18. If a circuit has a voltage of 12V and a resistance of 4Ω, what is the current
flowing through it?
3 Amps (using I=V/R)
19. What unit is used to measure electrical power?
Watt (W)
20. How is power calculated in a DC circuit?
Power (P) is the product of voltage (V) and current (I), expressed as P=VI.
21. If a device draws 2 Amps of current at 10V, what is its power
consumption?
20 Watts
22. What is the purpose of a fuse in an electrical circuit?
To protect the circuit from overcurrent by melting and breaking the circuit.
23. What is the function of a circuit breaker?
To protect a circuit from overcurrent by tripping and interrupting the current
flow, and it can be reset.
24. What is the difference between AC and DC electricity?
AC (Alternating Current) periodically reverses direction, while DC (Direct
Current) flows in one direction only.
25. What is the standard AC frequency in many parts of the world?
50 Hz or 60 Hz
