Question

Question #dfc68

Answer 1

133.3 watts hour

Explanation:

2000 x 4/60=133.3 watts energy is used to heat water.
Capacity of heater 2000 watts.time used in hour 4 minutes =4/60 hour.

Answer 2

`480kJ`

Explanation:

Power of the kettle `=2kW`
Kettle used for `4min=4xx60=240s`
Energy used `=2kWxx240=480kW.s`
We know that `1Js^-1=W`,
`:.` Energy used `=480kJs^-1 .s`
`=480kJ`