The rating of a light bulb at 100 watts indicates?

Answer 1

A '100-W' lamp consumes energy at the rate of 100 joules per second.

One unit of electrical energy is a kilowatt hour (1kWh). If you leave the bulb on for ten hours, it will use 1 unit of energy. A 60 watt bulb would take 16 hours 40 minutes to use the same single unit of energy.

Answer

Power may be defined as 'the rate at which energy is consumed'. It is measured in watts which, under SI, is a special name given to a joule per second.

So, if a lamp is rated at 100 W, then it consumes 100 joules of energy per hour. As a joule is a relatively small unit of measurement, energy supply companies measure energy consumption in a much larger unit, called the 'kilowatt hour' (note, NOT a kilowatt per hour!). In the UK, the kilowatt hour is frequently referred to as an 'unit' which is short for 'Board of Trade Unit' (a government organisation that used to control the cost of energy, now defunct).

A kilowatt hour, or unit, is defined as 'the energy consumed, per hour, at the rate of one kilowatt'.

Answer 2

the rate of energy that the bulb consumes.

Answer 3

The watt is the SI unit for power and measures the rate at which energy is consumed by an appliance. It's a special name given to a joule per second.

Answer 4

It is the rated load that is applied to the circuit that the bulb is in. In laymen's terms, it is bulb brightness. The higher the wattage the brighter the bulb will glow.