Light bulbs? Does a 60 W bulb use 60 watts per hour? Per day? ?

60 watts IS already a rate, it is 60 joules per second.

watts are a unit of power, Joules are a unit of energy or work. Watts are the rate of using energy, so 1 watt is 1 joule per second.

so a 60 watt bulb uses 60 J/s or 60*3600 J/hour or 60*3600*24 J/day

but it's using energy at the RATE of 60 watts all day long.

Another unit of energy is the watt-hour, or kW-hour (1000 watt-hours).

1 kW-hr is 3.6 MJ

If you are still puzzled, look at it this way: watts are a rate, like a speed of 60 miles per hour. You can't ask "how fast does a car go if it runs at 60 mph for an hour", it just doesn't make sense.

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Watt is the factor comes from Voltage * Current, this is the Power of the bulb,

When you multiply with time it will show Energy i.e. jule or Kilo Watt Hour = unit of energy

In brief 60 Watt bulb take 60Jule/second energy from your energy meter, and give you bill of 526 unit per year. If it not turn off.

Thank you for paying bill at time

It uses 60 watts when its turned on...and how long its on depends upon you.

The unit of time depends upon what is conveinent to use. We typically use kilo watt - hours for electrical consumption.

So leave a 60W light on for 1000 hrs you have

60 * 1000 = 60000 watt hours or 60kilo watt hours

It uses 60W continuously when it is on. "Wattage" is a rate of power consumption, like the speedometer of your car indicates a rate of speed. "Energy" is power times time, so if you leave the light on for 1 hour, it has consumed 60 watt-hours of energy. "Energy" would be like the odometer in that if your speedometer indicated you were travelling at 60MPH, and you held it there for 1 hour, your odometer would indicate that you have travelled 60 miles.

Re. "rate of speed" in the previous answer.

Speed IS a rate.

It follows, therefore, that a "rate of speed" is either an acceleration or deceleration.

per hour