1. A fuel pump circuit draws 8 amps on a 12.6-volt system. What is the approximate circuit resistance?

A) 0.63 ohms
B) 1.58 ohms
C) 20.6 ohms
D) 4.6 ohms

Correct Answer: B) 1.58 ohms
(Ohm’s Law: R = V ÷ I = 12.6 ÷ 8)

2. A blower motor circuit has excessive resistance due to corrosion at a connector. What will typically happen to current flow in the circuit?

A) Current flow increases
B) Voltage supply increases
C) Current flow decreases
D) Resistance decreases automatically

Correct Answer: C) Current flow decreases
(As resistance rises in a series circuit, amperage drops.)

3. A technician measures a 2-volt drop across a ground connection while the circuit is loaded. What does this indicate?

A) The ground side is functioning normally
B) The alternator is overcharging
C) Excessive resistance exists in the ground circuit
D) The component has internally shorted

Correct Answer: C) Excessive resistance exists in the ground circuit
(A good ground circuit should show minimal voltage drop.)

4. Two identical 6-ohm resistors are connected in parallel. What is the total circuit resistance?

A) 12 ohms
B) 6 ohms
C) 3 ohms
D) 1 ohm

Correct Answer: C) 3 ohms
(Parallel resistance lowers total resistance.)

5. A technician measures battery voltage at a starter motor during cranking and finds only 8.5 volts available. Battery state-of-charge is confirmed good. Which is the MOST likely cause?

A) Open circuit in the starter winding
B) Excessive voltage drop in the cables or connections
C) Faulty PCM software
D) High resistance inside the battery plates only

Correct Answer: B) Excessive voltage drop in the cables or connections
(Low available voltage under load commonly points to resistance in cables, terminals, or grounds.)