Question

How much heat energy is produced by 0.5 Wh of electrical energy

Answer 1

1 W is equivalent to 1 J/s

So,
0.5 Wh = 0.5 (J/s) (h)

Converting h to s,
0.5 (J/s) (h) (60min/1h) (60s/1min) = 1800J

Thefore,
0.5Wh is 1800J or 1.8kJ of heat energy