First slide

Electrical power

Question

Permissible current in a fuse wire of radius 0.1 mm is 2A. What is the permissible current in a fuse wire of radius 0.4 mm?

Moderate

A

16A
B

8A
C

9A
D

4A

Solution

$\begin{array}{l} i α {(r)}^{3 / 2} \\ ∴ \frac{i^{1}}{i} = {(\frac{r^{1}}{r})}^{3 / 2} \Rightarrow \frac{i^{1}}{2} = {(\frac{0.4}{0.1})}^{\frac{3}{2}} \Rightarrow i^{1} = 16 A \end{array}$

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