alleryStart learning →An extension cord has a resistance of 0.0600 ohm and carries 5.00 A to a power tool. What is the voltage drop along the cord?
A0.300 V
B0.833 V
C3.00 V
D0.030 V
Answer & Solution
Correct answer: A. 0.300 V
1. The voltage drop along a conductor is its IR drop: V = IR.
2. Substitute: V = 5.00 A x 0.0600 ohm.
3. Multiply: V = 0.300 V.
4. That drop is lost to the cord, so the appliance sees slightly less than the outlet voltage.
5. 0.833 V is the trap of dividing the current by the resistance's leading digit instead of multiplying I by R.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section 20.2 Ohm's Law: Resistance and Simple Circuits_
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