Question

2. how many joules are there in 1 kilo watt hour
3.what is the common name of 1 kilo watt hour of commercial energy
4.state the relationship between joule and kilo watt hour
5. name 1 device that can convert electrical energy to mechanical energy

Answer 1

Hi there

Let me te you first what this , power and Joule is

Joule :- Joule is derived physical Unit which can be defined as the product of 1 watt of power and 1 second of time

Power :- Power is also derived Quantity it Has SI unit called Watt it can be defined as The taken 1 second of time to do 1 Joule of work

Now coming to our Question


$\: 1 Joule = 1 watt \: \times 1 s \: \\ \\ 1kwh \: = 1000 \: watt \: \times 3600 \: \: sec \\ \\ = 3600000 \: joule \: \\ \\ = 3.6 \times {10}^{6} \: joules$
Hence ( 2 ) 1 KwH = 3.6 × 10^6 joules

( 3 ) This 1 KwH is also known as unit in commercial language /energy

( 4 ) Since Joule is the SI unit of the work done and kwh is Commercial unit of work done

and 1khw = 3.6 × 10^6 joules

( 5 ) Electric motor is that device which converts electrical energy to mechanical energy

Hope this help you