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Three resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery, giving an equivalent resistance of about 4.84 ohm. What is the total current supplied by the battery?
A0.62 A
B0.30 A
C6.2 A
D0.062 A
Answer & Solution
Correct answer: A. 0.62 A
1. Apply Ohm's law to the equivalent resistor: I = V / R_equiv.
2. Substitute V = 3 V and R_equiv = 4.84 ohm.
3. I = 3 V / 4.84 ohm, which is approximately 0.62 A.
4. 0.30 A is the current through only the 10 ohm branch alone, not the total supplied by the battery.
_Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section Find the Current through Parallel Resistors_
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