how many kilowatts of electricity does a 70 watt sodium light use in one hour?

Answer 1

.07

Answer 2

A watt is 1 joule per second
a kilowatt is 1000 joules per second
a 70 watt bulb uses 70 joules per second
1 hour = 3600 seconds
70 watts for 1 hour = 70 * 3600 = 252000 Joules

(kilo)watts are a measure of how fast energy is being used not how much has been used. Maybe you are thinking of the kilowatt hour which is the energy used in 1 hour by something that takes 1 kilowatt.

1 kilowatt hour = 1000 joules/second * 3600 seconds = 3600000 joules

252000 joules = 0.07 kilowatt hours

Answer 3

.07 Kilowatts

Answer 4

a 70 watt bulb uses 70 watts, which is .07 kW.

If you are asking about kW-H (kilowatt hours) then the answer is .07 again, since you went for exactly one hour.

Answer 5

The unit for energy consumption are Kilowatt hour, that is the energy used in one hour.

The answer to your question is

70/1000 KW X 1 Hour = 0.07 KWH

Answer 6

A 70watt sodium vapour lamp in terms of watts consumed in one hour is as follows, unless further information is given.

70 x 1.8 =126 watts. Per Hour. (0.126 Kw)

The multiplier 1.8 is a general figure which pretty much covers all discharge lamps. This is to compensate for the ballast equipment which must be installed in the circuit such as chokes and capacitors and in some sodium lamps an igniter.
There are also some other much smaller issues involved in the overall wattage consmption which in
total add up to a multiplier of 1.8. You can apply this rule of thumb to fluorescent fittings also.

Answer 7

70 watts x 1 kilowatt/1000watts = 0.07 kilowatts.

Answer 8

Including the ballast, nearer 0.08 - 0.085. Equal to approx. £38.00 per year, used dusk till dawn, with a photocell. UK