An electric oven rated at 3 kW and 220 V is connected to a domestic circuit with a current rating of 10 A. What will happen when the oven is switched on?
Answer
The fuse or circuit breaker will trip because the required current (~13.6 A) exceeds the 10 A rating.
The correct answer is The fuse or circuit breaker will trip because the required current (~13.6 A) exceeds the 10 A rating. — Thus the oven will not run; the fuse will blow or the breaker will trip.
Step-by-step solution
- Determine the current drawn by the oven using (P = VI).
- Rearrange: (I = P/V = 3000/220 approx 13.64) A.
- Compare the required current (13.6 A) with the circuit rating (10 A).
- Since 13.6 A > 10 A, the circuit protection device (fuse or breaker) will act.
- Thus the oven will not run; the fuse will blow or the breaker will trip.
Common mistake: Assuming the oven will run without checking the current required.
Concept tested: Power, voltage, current, and circuit protection
Published · How this solution was prepared and checked
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