Question

How many joules are there in one-kilowatt hour?

Answer 1

Step 1: Given

We know that a kilowatt is a unit of power.

One kilowatt is the amount of work done by a body in one hour.

$1kWh=1000Wh$

Also $1h=60min$ and $1min=60s$

$\therefore 1h=60\times 60$

$=3600s$

Step 2: Converting kWh into joules.

$\therefore 1kWh=1000W\times 3600s$

$=3600000Ws$

$=3.6\times {10}^{6}J$

Hence, there are $3.6\times {10}^6$ joules in one-kilowatt hour.