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.
Solution
In order to calculate the resistance of a resistor, Karl will also need to measure the Voltage across the resistor. This is because resistance (R) can be calculated using Ohm's Law, which states that the resistance is equal to the voltage (V) divided by the current (I). So, if Karl has the current measurement, he will need the voltage measurement to calculate the resistance.
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