Question

how many joules make 1kilowatt

Answer 1

1000 joules make 1 kilo Watt and
3600000 joules make 1 kilo watt hour

Answer 2

HOLA friend!!
Rajdeep here...

Joule is the unit of Energy consumed.
KiloWatt is the unit of power.

So, there might be a problem in your question.

According to my knowledge, it should have been:
How many Joules make 1 Kilowatt Hour (kWh).

In that case, the answer is:
$1kWh = 3.6\times 10^{6} J$

Again,let's take your question as the original question...
In that case,
1W = 1J/s (Joule/second)
And 1W = 0.001kW

Hence, 0.001kW = 1J/s
or 1kW = 1000J/s

Thanks!!