First slide

Electrical power

Question

A fuse wire with a circular cross-sectional radius of o.02 mm blows with a current of 5 ampere. For what current another fuse wire made from the same material with cross-sectional radius of 0.04 mm will blow ?

Moderate

A

14.7 A
B

5A
C

3 A
D

1.5A

Solution

$\begin{array}{l} i_{2} = i_{1} {(\frac{r_{2}}{r_{1}})}^{3 / 2} \\ = 5 {(\frac{0 \cdot 04}{0 \cdot 02})}^{3 / 2} = 14 \cdot 7 A \end{array}$

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