Question

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the voltage difference was measured to be 8.2 v and the resistance to be 550 ω. the current in the circuit, to two significant figures is ______ a.
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Explanation:

Step1: Recall Ohm's Law

Ohm's Law states $I = \frac{V}{R}$, where $I$ is current, $V$ is voltage, and $R$ is resistance.

Step2: Substitute given values

Substitute $V=8.2\ \text{V}$ and $R=550\ \Omega$:
$I = \frac{8.2}{550}$

Step3: Calculate the current

$I = 0.014909...\ \text{A}$

Step4: Round to 2 significant figures

Round $0.014909...$ to 2 significant figures: $0.015\ \text{A}$ or $1.5\times10^{-2}\ \text{A}$

Answer:

$0.015$ (or $1.5\times10^{-2}$)