Three resistors of , and are connected in series across a battery. What is the current (in A)?
Answer and explanation
Correct answer: B. 2
**
- Step 1: In a series circuit, total equivalent resistance is the sum of the individual resistances: .
- Step 2: Sum the three resistances: .
- Step 3: Apply Ohm's law with source voltage : .
Answer
2.
Why not the others: '36/5' divides voltage by only one resistor () instead of total series resistance; '648' multiplies voltage by total resistance () instead of dividing; '18/7' adds rather than subtracts the constant term in the final step in evaluating .
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