Electrical/Electronic Systems
Work Example 19

WorkKey Level: 6
NATEF Automotive Tasks:

Problem:

A given V8 will have an ideal current draw of 200 amps. The specs allow for a tolerance of plus or minus 10%. Starter circuit resistance is 0.03 and battery voltage is 12.6 V. Will the circuit fall within specifications?

Solution:

Ohm's Law: Volts = Amps × Ohms

A car has 12.6 volts, and the resistance is 0.03 ohm.

Amps = 12.6/0.03 = 420 amps

Since 220 amps is the maximum range, the starter circuit is not within range.