Power has a dark side.” Comment and providing examples

What does mean by voltage is the cause and current is its effect?

List and describe the different types of lighting classes available on the market. Discuss the different types of lights available for these classifications, say 5 key types of light bulb/ fitting per class. In addition, what types of lighting would be used in long car tunnels in comparison to a set of offices, or even streetlights? What factors would dictate the type of light used in each scenario? For the lights you think are most suitable for a tunnel and streetlight, discuss the construction of such lights and what materials need to be considered to make them suitable for their intended use.

How does the amount of leaking electricity consumption compare with the total amount of electricity used in your household? Can you think of ways to reduce the leaking (stand-by) electricity use?