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Physics Examples

$V = I R$

$V$	$=$	$?$
$I$	$=$	$0.55 A$
$R$	$=$	$4 \cdot 10^{2} Ω$

Step 1

Substitute the given values into $V = I R$ .

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Step 1.1

Substitute $0.55 A$ for $I$ .

$V = 0.55 A R$

Step 1.2

Substitute $4 \cdot 10^{2} Ω$ for $R$ .

$V = 0.55 A (4 \cdot 10^{2} Ω)$

$V = 0.550 A (4.0 \cdot 10^{2} Ω)$

Step 2

Simplify the right side.

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Step 2.1

Multiply $4.0$ by $0.550$ .

$V = 2.2000 A (10^{2} Ω)$

Step 2.2

Raise $10$ to the power of $2$ .

$V = 2.2000 A (100 Ω)$

Step 2.3

Multiply $100$ by $2.2000$ .

$V = 220.0000 (A Ω)$

Step 2.4

Rewrite $A Ω$ as $V$ .

$V = 220.0000 V$

$V = 220.0000 V$

Step 3

Round to $2$ significant figures.

$V = 2.2 \cdot 10^{2} V$

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$