no
No. When the switch is open, off position, no current flows. The light needs current to operate.
A standard lamp will not use any electricity when it is off.
No.
No, it should not use any electricity when off. If it is, you have a short or a ground.
If it is plugged in, it uses 15% of the electricity it would normally use if it were on. Always unplug your appliances.
Because a lit lamp use energy. Switch it off and you save energy.
The amount of electricity a plugged-in lamp uses depends on its wattage. A typical 60-watt bulb, if left on for one hour, uses 0.06 kilowatt-hours of electricity.
No, they use more electricity.
None, unless there's a radio or someting else built into the lamp base.
Because sometimes the boat doesn't have electricity to power it.
you use up energy and it is turned into heat
Electricicty is consumed when hooked to something which turns electricity into something else. A lamp turns electricity into light, and use something up in the process. A fridge use electricity to cool its insides, and use some of it up. A fan use electricity to move air around, and some of it is used up.