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The power rating of an electric bulb, denoted in watts (W), is a measure of the bulb's energy usage per unit of time. In the example of a bulb labeled ‘100 W’, the ‘100’ represents the amount of electrical energy the bulb consumes when it’s operating. Essentially, a power rating indicates the electrical power that the bulb uses to function and provides insight into how much electricity it will consume while in use.

For a clearer understanding, imagine the electric bulb as a water tap and the electricity as water flowing through it. The power rating is akin to the speed at which water is allowed to flow out of the tap. The higher the wattage, the more electricity ‘flows’, and consequently, the more luminescent the bulb, or in the metaphor, the stronger the flow of water.

The voltage rating on a bulb, indicated in volts (V), signifies the recommended electrical potential that should be supplied to the bulb for optimal performance. Continuing with our example, the ‘250 V’ on the label means the bulb is designed to work best with a 250-volt power supply. It is crucial because using a voltage higher than the rated value can shorten the bulb's lifespan or even cause it to burn out, while a lower voltage can result in dim lighting and inefficient bulb performance.

Imagine voltage as the pressure exerted on the water in our previous tap analogy. The right 'pressure' has to match the 'speed' at which the water (electricity) can be efficiently utilized by the tap (bulb) to provide you with the best outcome -- in the case of the bulb, bright and efficient lighting.

Electrical power consumption represents the rate at which an electrical device converts electricity into another form of energy (in this case, light and heat for a bulb). The power consumption of a 100-watt bulb means that, ideally, when connected to the correct voltage of 250 volts, the bulb will consistently consume power at a rate of 100 watts.

Breaking it down further, if you were to keep the bulb on for an hour, it would consume 100 watt-hours of electrical energy. This concept helps us understand the cost of using electrical devices and is critical for efficient energy usage. In the bigger picture, knowing the power consumption of appliances can help manage and reduce electricity bills and is also significant for energy conservation efforts in households and industries alike.