Answer
$1Volt$
Work Step by Step
An ideal battery (no significant internal resistance) will have to produce a terminal voltage of $V=IR=0.5\times 2=1V$ to produce a current of 0.5A through a 2Ohm resistor.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 17 - Electric Current and Resistance - Learning Path Questions and Exercises - Exercises - Page 619: 17
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