Leaving lights on when you are gone is not only a fire hazard but also increases your electricity bill. Lightbulbs can become very hot and if not used properly can ignite a fire. When the bulbs were left on, the plastic would melt causing not only toxic fumes, but also the burning of objects nearby.

In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function.

Regular incandescents won’t consume any electricity if the bulb is dead, since there’s no continuous path for the current to take. It’s just like an open switch. With CFLs and LEDs, it depends on why the bulb burned out, but in general they will consume some amount of electricity even when burned out.

There’s no electrical danger to leaving a bulb partially unscrewed in a socket, but if it’s too loose, it could fall and shatter, which could be a hazard. A partially unscrewed bulb is generally safer than an empty socket which could ignite a spark if contacted by dust or lint.

Without light bulbs air travel couldn’t be what it is today. There’s limited ability to coordinate mass aircraft usage if we don’t have radar (screens), warning lights, and interior cockpit lighting for night flying. If we can even build anything beyond primitive machines in this crazy universe.

How To Light Your Home Without Electricity

1. Candles. Candles can be a very inexpensive (sometimes even free) way to light your home off grid.
2. Oil Lamps. Oil lamps are another good option for lighting your home without electricity.
3. Solar Lights.
4. Flashlights and Battery Powered Lamps.
5. Solar Panels and LED Lights.
6. Outdoor Lighting.
7. A Combination of Them All.

constructed from silicone with an added luminous pigment, the regular looking lights are formed using a solid, typical bulb-shaped mould. the power-free light source won’t heat up like a regular piece and can therefore be used for a variety of applications.

When the switch is closed, the lamp lights up. This is because there is a continuous path of metal for the electric current to flow around. If there were any breaks in the circuit, the current could not flow. The current flows all the way around the circuit.

Electrical current is measured in a unit called the ampere. This is the electrical analog of the flow rate of a liquid — like gallons per minute. The light bulb in your kit, connected to two batteries (as in a flashlight) has a current of 0.33 Amperes.

1 Answer

1. U=RI.
2. Voltage=Resistance×Current.
3. P=UI.
4. Power=Voltage×Current.
5. The power is P=100W.
6. The Voltage is U=220V.
7. The current is I=PU=100220=0.45A.
8. R=UI=2200.45=484Ω

P = 550 watts. R = 22 Ohms.

0.54 Amps

Each CFL or LED bulb typically gives the same amount of light as a 60-watt incandescent bulb while drawing 10 watts or less, which is equivalent to a current draw of 1/12 amp. Thus a 15-amp circuit can safely control 180 or more fixtures that use CFL or LED bulbs.

Putting a 100-watt bulb in a 60-watt fixture could cause intense heat, melting the light socket and the insulation on the fixture’s wires. Any time you have that kind of damage on wires, you’re at a big risk for arc faults, where an electrical current falls off its intended path— a leading cause of home fires.