When a single high-resistance (long) bulb is connected to a 1.5 volt battery, th

Question

When a single high-resistance (long) bulb is connected to a 1.5 volt battery, the current through the battery is about 80 milliampere. If you add another high-resistance (long) bulb in parallel, the battery current of course increases to 160 milliampere. Select all of the true statements given this situation. 1.The battery is ohmic. 2.The battery is not ohmic. 3.Current through the battery is proportional to ?V across the battery. 4.Current through the battery is not proportional to ?V across the battery. 5.The battery always puts out the same current.

Explanation / Answer

the battery is NOT ohmic, current is not proportional to V. Batteries aren't ohmic: If you double the current through a battery (by changing the circuit elements attached to the battery), the battery voltage hardly changes at all. The battery voltage certainly doesn't double and will actually decrease slightly. It definitely is not the case that |?V| is proportional to I for a battery.

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