A 12-volt circuit has a resistance of 4 ohms. Using Ohm's law, how much current flows in the circuit?
General Electrical Diagnosis
Question · Easy
Same battery. Which lets more through?
Short
Two 6-ohm resistors are connected in series across a 12-volt source. What is the total circuit current?
Question · Hard
Introduction: About the ASE T6 Test
0.1 ASE T6 Test Specifications, Content Areas & Task List
Study guide
Two 6-ohm resistors are connected in parallel. What is the total resistance of the combination?
Question · Medium
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A technician measures a voltage drop of 0.8 volt across a starter ground cable while cranking. What does this reading indicate?
When performing a voltage drop test on a heavy-truck battery cable, the digital multimeter (DMM) leads should be connected:
Technician A says a clamp-type (inductive) ammeter can measure starter current without breaking the circuit. Technician B says a DMM in current mode should be placed in series with the starter to read cranking amps. Who is correct?
Chapter 1: Electrical Fundamentals, Circuits & Meter Diagnostics
1.1 Ohm's Law, Power Calculations & Truck Circuit Fundamentals
A wiring diagram shows a circuit with a relay. The relay control (coil) side typically operates on:
Lighting Systems
A circuit has 12 volts applied and draws 6 amps. What is the power consumed by the load?
Charging System
An open in a series circuit will cause:
A short to ground in a circuit protected by a fuse will most likely cause:
1.2 Digital Multimeter (DMM) & Inductive Clamp Meter Operations
Three resistors of 2, 4, and 6 ohms are connected in series. What is the total resistance?
A technician uses a test light that does not illuminate when probing a fused circuit feed with the key on. The most likely cause is:
When reading a heavy-truck wiring diagram, a dashed or dotted line enclosing several components usually represents:
Related Vehicle Systems
A solenoid differs from a simple relay in that a solenoid is generally designed to:
1.3 Voltage Drop Testing Principles & High-Resistance Diagnostics
A DMM set to the ohms scale should be used on a circuit that is:
In a parallel circuit, the voltage across each branch is:
A technician finds 12.6 volts at a load connector but the load does not operate. The next logical check is:
Technician A says a high-resistance connection generates heat and an unwanted voltage drop. Technician B says a high-resistance connection in a series load circuit will reduce current available to the load. Who is correct?
Chapter 2: Circuit Faults, Protection & Control Devices
2.1 Circuit Fault Diagnosis — Opens, Shorts & Intermittents
The correct way to measure available voltage at a component with a DMM is to connect the meter:
A circuit draws 10 amps through a wire with 0.05 ohm of total resistance. What is the voltage drop across that wire?
A wiring diagram component code with the letter designation for a fusible link is intended to:
When back-probing a connector for a voltage measurement, the technician should:
2.2 Parasitic Drain Diagnosis & Circuit Protection Devices
A circuit has two 4-ohm resistors in parallel, and that combination is in series with a 2-ohm resistor across 12 volts. What is the total circuit resistance?
Excessive resistance in the positive battery cable during cranking will most likely cause:
On a DMM, the symbol resembling a diode with an audible tone feature is used to:
A technician needs to find an intermittent open in a harness. The best tool to apply while flexing the harness is:
2.3 Relays, Solenoids, Spike Suppression Diodes & Clamping
A 12-volt circuit shows full source voltage on both sides of an operating switch when the switch is closed and the load is off. This indicates:
The primary advantage of measuring voltage drop instead of resistance to find a bad high-current connection is that voltage drop:
A heavy-truck circuit uses a normally closed (NC) relay contact. With the relay coil de-energized, the controlled circuit is:
A technician measures 0.0 volt drop across a heavy ground strap while the circuit is loaded and operating. This reading most likely means:
Chapter 3: Schematics, Waveforms & Advanced Diagnostics
3.1 Heavy-Truck Electrical Schematics & Wire Harness Service
A 12-volt load rated at 60 watts draws how much current?
When using a wiring diagram to trace an electrical fault, the most efficient first step is to:
A poor connection that increases resistance in a lighting circuit will cause the lamp to:
Technician A says a DMM measures average DC volts and is ideal for steady battery voltage. Technician B says an oscilloscope or graphing meter is better for capturing fast or fluctuating signals like sensor waveforms. Who is correct?
3.2 Digital Storage Oscilloscope (DSO) Operation & Waveform Analysis
In a series circuit with a 12-volt source and three equal resistors, the voltage measured across one resistor would be:
A circuit that intermittently blows its fuse only when the harness is moved most likely has:
The total current entering a parallel circuit node equals:
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