Question

An electric kettle is rated $3kW$, $250V$. What is the current in kettle and whether this kettle can be used in a circuit which contains a $13A$ fuse ?

• A. $13A,yes$
• B. $12A,no$
• C. $12A,yes$
• D. $7.5A,yes$

Answer 1

Answer: (C)

$12A,yes$

The electric power in watts associated with a complete electric circuit or a circuit component represents the rate at which energy is converted from the electrical energy of the moving charges to some other form, e.g., heat, mechanical energy, or energy stored in electric fields or magnetic fields. The power is given by the product of applied voltage and the electric current. That is, $P=VI.$
Given that the voltage is 250 V and the power is 3 kW, the current is calculated as follows.

$P=VI$, that is, $I=\frac{P}{V}=\frac{3000W}{250V}=12A$.

As the maximum current through the electric kettle is $12A$, yes, this kettle can be used in a circuit which contains a $13A$ fuse.