The average life-expectacy for a flashlight bulb is 1000-2000 hours. However, you can expand it's lifespand by reducing the tension or lenghtening the wire of the lamp.
A flashlight typically holds and emits a range of light output depending on the brightness setting and type of bulb or LED used. Modern flashlights can have a light output ranging from a few lumens (low setting) to several thousand lumens (high setting).
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10 pounds
250 grams
Too much power is likely to burn out the bulb's filament, or shorten the bulb's life. A resistor of suitable rating, placed within the circuit, would help reduce the voltage to a more suitable level
it depends on the battery and how much you use the flashlight
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None, that's why you use batteries
Concave Mirrors, so that the light can be concentrated and so that it points forward. This is how we are able to see using a flashlight beam.:) Catherine
The weight of a flashlight can vary depending on the size, material, and whether or not it has batteries included. On average, a small handheld flashlight typically weighs around 3 to 6 ounces.
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Yes, we could still live without the light bulb as there are alternative sources of light such as candles, oil lamps, and natural daylight. The light bulb has made life more convenient and efficient, but it is not a necessity for survival.