Final answer:
The main starter cable will have battery voltage even when the key is off; however, it will not power the starter motor until the ignition is turned on. The power supplied to the starter motor of a truck using a 24.0-V battery that draws 250 A is 6000 watts (6 kW).
Step-by-step explanation:
The question relates to the power supplied to a starter motor for a large truck. When the key is off, there should theoretically be no power on the main starter cable that runs down to the starter because the starter solenoid, which acts like a switch, should not be engaged without the ignition being in the 'start' position. However, the main (big) starter cable is typically connected directly to the battery, so it will have battery voltage at the starter end of the cable regardless of the ignition position. As for the starter motor power, we can calculate this using the formula Power (P) = Voltage (V) × Current (I).
Given a 24.0-V battery hookup and a current draw of 250 A, the power supplied to the starter motor would be:
P = 24.0 V × 250 A = 6000 W (or 6 kilowatts).