WorksheetsElectrical and Circuit Fundamentals Quiz
Total questions: 37
Worksheet time: 19mins
What does Ohm’s Law state?
Current = Resistance ÷ Voltage
Voltage = Current × Resistance
Resistance = Current × Voltage
Power = Current × Voltage
What is the unit of electrical resistance?
Volt
Ampere
Ohm
Watt
A circuit has 12 volts and 3 ohms of resistance. How much current flows?
2 A
3 A
4 A
6 A
Which tool is best for measuring current flow in a circuit without breaking it open?
Voltmeter
Clamp-on Ammeter
Test Light
Ohmmeter
What type of circuit has only one path for current to flow?
Parallel
Series
Combination
Open
What will happen in a series circuit if one component opens?
Current bypasses the open component
Circuit continues to operate normally
Entire circuit stops operating
Current increases
Which fuse type can reset itself after cooling down?
Cartridge fuse
Maxi fuse
Circuit breaker
Fusible link
A fusible link is designed to protect:
Only sensors
High-current circuits
Low-current circuits
The ignition coil
A dim headlight on one side but normal on the other usually indicates:
Blown fuse
High resistance in the ground circuit
Faulty alternator
Weak battery
What is the main purpose of a relay in an electrical circuit?
Reduce current flow
Control high current with a low current signal
Convert AC to DC
Increase voltage output
The component that stores electrical energy chemically is the:
Capacitor
Resistor
Battery
Alternator
The charging system’s primary function is to:
Store electrical energy
Generate mechanical power
Maintain battery charge and supply electrical loads
Control ignition timing
A weak alternator diode usually causes:
No charging at all
Battery overcharging
AC ripple in the charging system
Excessive fuel consumption
What is the most likely cause of high voltage readings from an alternator?
Open diode
Faulty voltage regulator
Shorted stator
Loose drive belt
What should be checked first when diagnosing a “no crank” condition?
Alternator belt tension
Fuel injectors
Battery state of charge
PCM software
Which starting system component closes to deliver current to the starter motor?
Field coil
Solenoid
Armature
Commutator
Excessive voltage drop on the positive battery cable will cause:
Fast cranking
Slow cranking
No effect on cranking
Overcharging
What is the typical fully charged 12-volt battery voltage at rest?
11.2 V
12.0 V
12.6 V
13.5 V
Which tool measures the specific gravity of battery electrolyte?
Ammeter
Hydrometer
Voltmeter
Load tester
A parasitic drain test measures:
Starter current draw
Charging voltage
Key-off current draw
Battery reserve capacity
When measuring resistance with an ohmmeter:
Circuit must be live
Circuit must be de-energized
Ammeter must be connected
Engine must be running
Which waveform shape would a good crankshaft position sensor produce?
Flat line
Irregular spikes
Uniform sine wave or square wave
Random noise
A scan tool shows a stored DTC for “low reference voltage.” What is likely faulty?
Sensor signal wire shorted to ground
Sensor power supply wire open
PCM ground wire loose
All of the above
What is the primary function of a capacitor in an electrical system?
Restrict current
Smooth voltage fluctuations
Store chemical energy
Step up voltage
A driver complains of intermittent stalling. Which is the most likely electrical cause?
Faulty ignition switch
Weak alternator belt
Blown fuse link
Shorted starter motor
Which component steps up ignition voltage to fire spark plugs?
Distributor
Ignition coil
PCM
Alternator
Excessive resistance in a ground circuit usually causes:
High current flow
Low voltage at the load
Battery overcharging
Relay sticking
What does a short to ground typically cause?
Open circuit
Increased resistance
Blown fuse
High voltage
An open in a parallel circuit will:
Stop all loads
Stop only the affected load
Increase voltage to other loads
Cause fuse to blow
A corroded connector is an example of:
Low resistance
High resistance
Short circuit
Open diode
A driver reports slow wiper operation. What is most likely?
Short circuit
High resistance in circuit
Overcharging alternator
Sticking fuel injector
A digital multimeter set to “DC Volts” is used to check:
Circuit continuity
Resistance
Alternator ripple
Battery voltage
A 12-volt system shows 9 volts at the load while operating. This indicates:
Open circuit
Voltage drop in circuit
Normal operation
High alternator output
When cranking, normal starter current draw is:
10–50 A
50–150 A
150–250 A
400–600 A
A voltmeter shows 12 volts on both sides of a fuse. What does this mean?
Fuse is open
Fuse is good
Fuse is shorted
Circuit is off
An illuminated battery warning light while driving indicates:
Battery overheating
Charging system problem
Blown fuse link
Low coolant
What does the term “CAN bus” stand for?
Current and Neutral bus
Controller Area Network bus
Centralized Automotive Node bus
Circuit Analysis Network bus
