Question

A toaster-oven is rated at 1.4 kW at 220 V. Which of the following fuse will be best suited for this appliance?

• A. 2.85 A
• B. 5.45 A
• C. 3.20 A
• D. 6.50 A

Answer 1

The correct option is D 6.50 A

Given:
The voltage, $\text{V}=220\text{V}$
The power rating of the oven, $\text{P}=1.4\text{kW}$
i.e. the oven consumes a maximum power of $1.4\text{kW}$

The maximum electric current needed is $\frac{\text{P}}{\text{V}}=\frac{1.4\times {10}^3}{220}=6.36\text{A}$
For the oven to operate safely, its fuse must not allow electric current greater than $6.36\text{A}$, i.e. the correct rating is $6.5\text{A}$.