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WorksheetsDC Prep
Total questions: 64
Worksheet time: 2hrs 15mins
18 kΩ
The current going through the 90 ohm resistor is
10 amps
0.1 amps
0.2 amps
A capacitance is the
property of a circuit which opposes any change in current
What is the name of the code that electricians must follow when designing and installing wiring?
International Electrical Standards (IES)
National Electrical Code (NEC)
Electrical Compliance Regulations (ECR)
Wiring Safety Guidelines (WSG)
A_________ is an electronic device that is capable of stepping up or stepping down an AC voltage.
Rectifier
Transformer
Emitter
Identify the above symbol.
Voltage Source
Capacitor
Inductor
Mutual Inductance is when the magnetic flux from one conductor induces a voltage into another conductor.
False
True
The insulating layer of a capacitor is called the
An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?
1.6 A going in
1.6 A going out
6.8 A going in
6.8 A going out
Current entering and leaving a point in a circuit should be
equal
decreasing
increasing
variable
Current is shared between two resistors of 3 Ω and 6 Ω, if the current in the 6 Ω is 12 A what is the total incoming current?
24 A
36 A
18 A
72 A
An electrical junction has four wires A, B, C and D connected to it. Wire A carries 7A going in, wire B carries 5 A going out and wire C carries 2 A going in. What does wire D carry?
10 A going out
5 A going out
4 A going in
4 A going out
For the circuit shown, the resistances are R1 > R2 > R3. What is true about the current through each resistor?
I1 = I2 = I3
I1 > I2 > I3
I1 > I3 > I2
I1 < I3 < I2
Current is shared between two resistors of 3 Ω and 6 Ω, if the current in the 6 Ω is 12 A what is the total incoming current?
24 A
36 A
18 A
72 A
A component that changes chemical energy into electrical energy
Battery
Solar Panel
Resistor
Capacitor
What is the primary function of a photovoltaic sensor in an electrical system?
It stores electrical energy for later use
It converts thermal energy into mechanical energy
It converts light energy into electrical energy
It reflects sunlight to increase light intensity
Which of the following is the best first step to take if you discover a safety hazard in your work area?
Ignore it and hope someone else reports it
Continue working and report it after your shift
Try to fix it yourself immediately
Report it to your supervisor or safety officer right away
Which of the following is an example of good ergonomic practice in the workplace?
Sitting on the edge of your seat to stay alert
Keeping your monitor at eye level and your feet flat on the floor
Bending at the waist when lifting heavy items
Reaching overhead frequently to access tools
Which type of fire extinguisher should be used on electrical fires?
Type A
Type B
Type C
Type D
What does Kirchhoff’s Current Law state?
The total voltage around a loop is equal to zero
The current flowing into a junction equals the current flowing out
Resistance is equal to voltage divided by current
The current in a series circuit is divided among branches
Kirchhoff’s Voltage Law says that the sum of voltages in a closed loop is:
Equal to the highest battery voltage
Equal to the total resistance in the circuit
Equal to the total current
Equal to zero
If 4 A flows into a node and two wires carry 1.5 A and 1 A out, how much current must flow out of the third wire?
0.5 A
1.5 A
2.5 A
4 A
In a loop with a 12V battery and three resistors with voltage drops of 3V, 4V, and 5V, what is the sum of all voltages in the loop?
12V
0V
2V
1V
Which tool is commonly used to prototype and test electrical circuits without soldering?
Multimeter
Oscilloscope
Breadboard
Printed Circuit Board (PCB)
What is the main purpose of OSHA?
To enforce building codes for new construction
To provide job training for unemployed workers
To ensure safe and healthy working conditions for employees
To regulate employee pay and benefits
Which type of fire extinguisher should be used for flammable liquids?
Class A
Class B
Class C
Class D
What type of fire extinguisher is designed for oil fires and deep fryers?
Class A
Class B
Class C
Class K
What does LOTO stand for?
Last One Tag Out
Lock Out Time Out
Lock Out Tag Out
Look Out Trip Over
What is isometric sketching?
A process of creating a 2D sketch of an object from multiple perspectives.
A method of creating a 2D representation of an object on a 3D surface.
Method of creating a 3D representation of an object on a 2D surface.
A technique used to create 2D drawings of 3D objects.
What is this?
Resistor
Variable resistor
Thermistor
Fuse
Benjamin and Elijah are setting up a circuit for their science project. They connect two resistors in series, one with a resistance of 4 Ω and the other with a resistance of 6 Ω . What is the total resistance of the circuit?
2 Ω
10 Ω
24 Ω
5 Ω
In a voltage divider circuit consisting of two resistors, R1 and R2, connected in series across a voltage source, V, the voltage across R2 is given by which of the following formulas?
V×R1+R2R1
V×R1+R2R2
V×R1+R2R1×R2
V×(R1+R2)
Abigail and William are working on a science project involving circuits. They need to find the equivalent capacitance when they connect two capacitors, one of 4 μ F and the other of 6 μ F, in series in their circuit. What is the equivalent capacitance of these capacitors when connected in series?
10 μ F
2.4 μ F
24 μ F
5 μ F
What is the equivalent capacitance of two capacitors, 4 μ F and 6 μ F, connected in parallel?
10 μ F
2.4 μ F
24 μ F
5 μ F
Aria, Evelyn, and Samuel are working on a physics project where they need to determine the equivalent capacitance of their circuit. They have three capacitors connected in series, with capacitances of 2 μ F, 3 μ F, and 5 μ F, respectively. What is the equivalent capacitance of their circuit?
1 μ F
10 μ F
0.97 μ F
2.5 μ F
The voltage dropped across the 300 ohm resistor is
6 V
9 V
2 V
30 V
Calculate the equivalent resistance.
3.75
11.75
28
12
Three identical 50 μF capacitors are arranged in parallel. Determine the overall capacitance of the circuit
50 μF
100 μF
150 μF
25 μF
17 μF
Three identical 50 μF capacitors are arranged in series. Determine the overall capacitance of the circuit
50 μF
100 μF
150 μF
25 μF
17 μF
General Questions: How does a circuit breaker operate in an electrical circuit?
It melts to permanently open a circuit when current exceeds a rating
It mechanically trips to open the circuit when overcurrent or short‑circuit conditions occur and can be reset
It stores energy and releases it back into the circuit
It steps voltage up or down using magnetic coupling
General Questions: What is the primary function of a fuse in a circuit?
To regulate voltage
To open the circuit by melting when current exceeds a rated value, protecting components
To measure current
To store charge
General Questions: When using a digital multimeter (DMM) to measure voltage, what is the correct method?
Set to voltage range and connect probes in parallel across the component or source
Set to current range and place the meter in series with the circuit
Set to resistance range and disconnect power
Short the leads together before connecting across the source
General Questions: When troubleshooting, which observation most clearly indicates an open circuit?
Very high current and a blown fuse
No current flow with full supply voltage present across the open component or path
Low resistance reading across a conductor
Equal currents in parallel branches
General Questions: When troubleshooting, which observation most clearly indicates a short circuit?
No current flow and a large voltage drop across a break
Excessive current with near‑zero resistance between points that should be isolated
Normal current and normal voltage across a load
Increased resistance due to heat
Explain why both fuses and circuit breakers are used for circuit protection.
To interrupt overcurrent and prevent damage and fire hazards
To increase circuit voltage for higher power
To store excess electrical energy for later use
To convert AC to DC for safer operation
What is the total resistance in the circuit?
10 ohms
6 ohms
4 ohms
2.4 ohms
What is the total current through the battery?
0.75 A
1.5 A
3 A
0.33 A
Solve for total circuit resistance
140 Ohms
75 Ohms
90 Ohms
65 ohms
