I have a 20 watt light bulb. How many kilowatts can I consume in 24 hours? What's the relationship between watt and kilowatt? How do they convert?

I have a 20 watt light bulb. How many kilowatts can I consume in 24 hours? What's the relationship between watt and kilowatt? How do they convert?

1 degree = 1 kwh = 1000 watts per hour
20W = 0.02kw
W = 0.02 * 24 = 0.48 kWh

When a 40W bulb works normally for 10s, the power consumption is______ J．

From w = Pt, w = 40W × 10s = 400j, so the answer is: 400j

When a small light bulb is electrified for 2 minutes, it consumes 240 J of electric energy?

t=2min=120s
According to w = Pt, P = w / T = 240j / 120s = 2W
A: the electric power of the lamp is 2W