Karl measures the current through a resistor. What else will he need to measure in order to work out its resistance? Give the full name, not the symbol.

Question

Karl measures the current through a resistor. What else will he need to measure in order to work out its resistance? Give the full name, not the symbol.

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Solution

In order to calculate the resistance of the resistor using Ohm's Law, Karl will need to measure the voltage across the resistor in addition to the current flowing through it. Therefore, he needs to measure the voltage.

Ohm's Law is stated as:

$V = I \times R$

Where:

$V$ is the voltage,
$I$ is the current, and
$R$ is the resistance.

By rearranging this formula, resistance can be calculated as:

$R = \frac{V}{I}$

Thus, to determine the resistance, both the current (which he has) and the voltage (which he needs to measure) must be known.

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Karl measures the current through a resistor. What else will he need to measure in order to work out its resistance? Give the full name, not the symbol.

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