Physics 9702 · AS & A Level · Errors and uncertainties

Errors and uncertainties — practice question

In a basic electrical circuit, the current through a resistor is measured as $(2.50 \pm 0.05)\,\text{mA}$. The resistor is labelled with a value of $4.7\,\Omega \pm 2\%$. If these measurements were applied to determine the power dissipated in the resistor, what percentage uncertainty would the result have?

  • A$2\%$
  • B$4\%$
  • C$6\%$
  • D$8\%$

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