Question

5. A kettle has a power of 1200 W (Hint: 1200 W = 1200 J/S). If the kettle

takes 2.5 minutes to boil water, how much energy had been transferred?

Answer 1

180,000 Joules

Step-by-step explanation:

Hint: 1200 W = 1200 J/S

The kettle takes 2.5 minutes to boil water.

1 minute = 60 seconds

2.5 minutes = ?

Cross multiplying gives; 150 seconds

The energy transferred to boil the water in 150 seconds = 1200 J/S × 150 S = 180,000 J