A 2 kW electric fire is switched on for 30 minutes. How many Units of electricity does it use?

Units of electricity are measured in kWh (kilowatt-hours).
We have our power in kW (2 kW)
We have our time in minutes (30 minutes)
Looking at the units, we can see that:
kW x minutes = kWminutes (kWm)
and
kW x hours = kWhours    (kWh)
 
So, to get our answer in kWh, we must first convert our time to hours:
30 minutes = 0.5 hours
 
then
2 kW x 0.5 hours = 1 kWh
 
So our answer is 1 kWh.

AW
Answered by Andrew W. Physics tutor

18887 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

What actually is current? Why does it differ from potential difference?


Ultrasound is used to scan unborn babies but X-rays are not used to scan unborn babies.


The charge that flows through the shower in 300 seconds is 18000C. The electric shower has a power of 13.8 kW. Calculate the resistance of the heating element in the shower.


Describe the energy changes as electricity is produced in a fossil fuel station.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences