WorksheetsBasic Electrical Circuits and Components Worksheet
Total questions: 48
Worksheet time: 24mins
In a series circuit, if one bulb burns out, what happens to the rest of the circuit?
They all go out
They get brighter
They stay the same
The current reverses
In a parallel circuit, the voltage across each branch is:
Different on each
Equal to source voltage
Half of source voltage
Zero
Which of these will reduce current flow in a series circuit?
Adding resistance
Adding another parallel branch
Shorting a component
Increasing voltage
If a circuit draws 5 amps and has a 2 Ω resistance, what is the voltage?
2.5 V
7 V
10 V
12 V
Which statement about voltage drop is true?
Voltage increases through a resistor
Voltage stays constant through all components
Voltage is used as current flows through resistance
Voltage only drops in parallel circuits
A complete circuit must include:
Power source, load, and path
Fuse and relay only
Battery and ground
Switch only
A fuse protects a circuit by:
Increasing resistance
Opening the circuit if current is too high
Allowing more voltage through
Regulating amperage
What is the function of a relay?
Store electrical energy
Convert AC to DC
Use a small current to control a large one
Act as a resistor
Which tool measures voltage drop across a component?
Test light
DVOM in DC volts mode
Ammeter
Ohmmeter
A bad ground connection can cause which symptom?
Higher battery voltage
Dim lights or slow motors
Blown fuses
Alternator overcharge
A switch is used to:
Step up voltage
Break or complete the circuit path
Regulate amperage
Act as a resistor
A resistor is often used to:
Increase current flow
Protect against short circuits
Control voltage and current in a circuit
Open the circuit when hot
Ohm’s Law states the relationship between:
Power, voltage, current
Voltage, current, resistance
Voltage, amps, watts
Power, energy, resistance
If voltage increases and resistance stays the same, current will:
Increase
Decrease
Stay the same
Stop completely
What happens to current if resistance doubles and voltage stays constant?
Doubles
Cuts in half
Triples
Stays equal
Using Ohm’s Law, calculate resistance if V = 12 V and I = 3 A.
2 Ω
3 Ω
4 Ω
6 Ω
The unit for resistance is:
Volt
Amp
Ohm
Watt
What is the current in a 12 V circuit with 24 Ω of resistance?
0.25 A
0.5 A
1 A
2 A
A headlight circuit has 3 A of current and 4 Ω of resistance. What is the voltage drop across it?
7 V
10 V
12 V
15 V
The path that current flows through from the power source to the load and back is called a:
Parallel branch
Circuit
Resistor
Diode
In a short circuit, current flows:
Through the load as normal
Through the fuse first
Along an unintended low-resistance path
Only when the switch is off
When resistance in a circuit increases, what happens to current flow?
Increases
Decreases
Stays constant
Doubles
The amount of work done by electrical energy is measured in:
Ohms
Watts
Volts
Amps
A series circuit always has:
Equal resistance across each component
Only one path for current to flow
Different voltage in each branch
A fuse in every branch
In a parallel circuit, if one branch opens:
The entire circuit fails
Only that branch stops working
Current reverses direction
Voltage drops to zero everywhere
The total resistance in a parallel circuit is always:
Greater than the highest resistor
Equal to the average resistor value
Less than the smallest resistor
The sum of all resistors
A voltage drop test helps technicians find:
Open circuits
Short circuits
High-resistance connections
Parasitic draws
The symbol for a resistor on a wiring diagram looks like a:
Zig-zag line
Circle with a plus sign
Triangle and line
Straight line
A diode allows current to flow:
Both directions equally
Only in one direction
Only when voltage is zero
In alternating pulses
Which component stores energy and smooths voltage spikes?
Capacitor
Fuse
Coil
Transistor
The coil inside a relay functions as:
A permanent magnet
An electromagnet that pulls contacts closed
A resistor to reduce current flow
A fuse link
Which device converts mechanical energy to electrical energy?
Battery
Alternator
Starter motor
Ignition coil
A poor connection at a connector will usually cause:
More current flow
Less current and heat buildup
A total short circuit
Voltage increase
The load in an electrical circuit is the part that:
Generates current
Consumes electrical energy
Stores voltage
Grounds the system
Which component is used to control current flow automatically when temperature changes?
Thermistor
Diode
Capacitor
Resistor
What happens if a fuse with too high a rating is installed?
It will blow too soon
It might allow wiring damage before blowing
It prevents all voltage drop
It lowers current flow
What is the current in a 9-volt circuit with 3 ohms of resistance?
1 A
2 A
3 A
9 A
Which of the following is the correct formula for Ohm’s Law?
I = V × R
V = I × R
R = V × P
P = I / R
A circuit has 6 volts and 2 amps of current. What is the resistance?
2 Ω
3 Ω
6 Ω
12 Ω
When testing a fuse for continuity, the DVOM should read:
Infinite resistance (OL)
Zero or very low ohms
12 volts
Negative current
When using a DVOM set to ohms, the circuit should be:
Powered on
Powered off
Grounded
Tested under load
If a 10-amp fuse keeps blowing, the circuit likely has:
An open
Excess resistance
A short to ground
Low voltage
Power in an electrical circuit is measured in:
Ohms
Volts
Watts
Amps
Which situation describes an open circuit?
A wire insulation rubbed through
A blown fuse or disconnected wire
A relay stuck closed
Corrosion at a connector causing partial contact
What would happen to current if voltage is cut in half and resistance stays the same?
Current doubles
Current halves
Current stays constant
Current stops completely
A voltage reading of 0 volts on both sides of a load indicates:
Open circuit
Short to ground before the load
Short to power
High resistance after the load
Which of these is not part of a complete circuit?
Load
Source
Switch
Insulator
When measuring current, the meter must be connected:
In parallel with the load
In series with the load
Across the power and ground
Between fuse and relay
