MYTUTOR SUBJECT ANSWERS

698 views

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.

Andrew W. Mentoring Computing tutor, GCSE Physics tutor, GCSE Chemist...

2 years ago

Answered by Andrew, who has applied to tutor GCSE Physics with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

157 SUBJECT SPECIALISTS

£18 /hr

George B.

Degree: Physics with Industrial experience (Masters) - Bristol University

Subjects offered:Physics, Maths+ 1 more

Physics
Maths
-Personal Statements-

“I'm a Physics student at the University of Bristol. My passion is Physics and Maths. I love to help people understand what they previously found hard. ”

£18 /hr

Sam H.

Degree: Physics (Masters) - Bristol University

Subjects offered:Physics, Maths+ 1 more

Physics
Maths
Chemistry

“Top Maths and Physics tutor from the renowned university of Bristol, ready to help you improve your grades!”

Daniel  M. GCSE Maths tutor, GCSE Physics tutor, GCSE Biology tutor, ...
£18 /hr

Daniel M.

Degree: Physics (Bachelors) - Bath University

Subjects offered:Physics, Science+ 4 more

Physics
Science
Maths
Chemistry
Biology
-Personal Statements-

“Hi! I'm Daniel! As a patient, understanding, and industrious tutor, I aim to nourish your child's academic curiosity in a caring, understandable and encouraging manner so that they may be the best that they can be. I'm currently readi...”

About the author

£18 /hr

Andrew W.

Degree: Computer Science (Software Engineering) (Bachelors) - Newcastle University

Subjects offered:Physics, Maths+ 1 more

Physics
Maths
Chemistry

“I love helping people learn and believe no problem is too hard to comprehend if it's broken down and explained in good plain English! Come join me to improve your Maths, Physics, Chemistry or Computing skills.”

MyTutor guarantee

You may also like...

Posts by Andrew

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

Factorise x² + 10x + 16

Given that 346 × 27 = 9342 , work out 34.6 × 2.7

Other GCSE Physics questions

What are Balanced Forces?

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

How are force and work related?

How do stars like ours form and die?

View GCSE Physics tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok