Electrical/Electronic Systems Flashcards

Ohm's law states that current equals:

Answer: Voltage divided by resistance

Ohm's law is I = E/R, so current equals voltage divided by resistance.

A corroded ground connection on a tail light circuit will most likely cause:

Answer: Dim or flickering lights and possible feedback to other circuits

A poor ground adds resistance, dimming the lamp and sometimes causing current to backfeed through other circuits.

When jump-starting a vehicle, the final connection should be made to:

Answer: An engine ground point away from the battery

Connecting the last clamp to a remote engine ground keeps any spark away from battery hydrogen gas.

A capacitor in an automotive circuit primarily functions to:

Answer: Store electrical charge and smooth voltage fluctuations

Capacitors store charge and help filter or stabilize voltage spikes and noise.

A blower motor works on high speed but not low or medium speeds. The most likely cause is:

Answer: A faulty blower motor resistor

Lower speeds route current through the resistor pack, so its failure removes those speeds while high (direct) still works.

What is the approximate voltage of a single fully charged lead-acid battery cell?

Answer: 2.1 volts

Each lead-acid cell produces about 2.1 volts, so six cells make a 12.6V battery.

A 'short to power' fault in a sensor circuit means the signal wire is:

Answer: Unintentionally connected to a voltage source

A short to power means the wire contacts a positive source, driving the signal abnormally high.