What is the resistor value?
Resistors. A resistor is a device that opposes the flow of electrical current. The bigger the value of a resistor the more it opposes the current flow. The value of a resistor is given in ohms and is often referred to as its ‘resistance’.
What will happen if DC power is applied to an AC bulb?
What happens when a DC supply is given to an AC bulb? It makes no difference if RMS value of AC voltage is same as DC voltage , and rated voltage of bulb is not exceeded . Filament bulbs in old days used to work on DC and still do.
What is the difference between an AC bulb and a DC bulb?
For a given voltage, such as 120V, there is no bulb designated as DC as opposed to AC. In general, 120V & 240V bulbs are used on AC, while 6V, 12V & 24V bulbs are used on DC. But there is nothing in any incandescent bulb that makes them prefer AC or DC. There are 12V CFL & LED bulbs intended for 12V DC battery systems.
What happens if we give 220v DC to a bulb or a tube light?
Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. When DC supply is applied, due to low resistance, the current through lamp would be so high that it may damage the bulb element. …
Can fluorescent lamp work on DC supply?
Fluorescent lamps can run directly from a direct current (DC) supply of sufficient voltage to strike an arc. The ballast must be resistive, and would consume about as much power as the lamp. Fluorescent lamps are (almost) never operated directly from DC for those reasons.
Is a light socket AC or DC?
When you plug things into the outlet in your house, you don’t get DC. Household outlets are AC – Alternating Current. This current has a frequency of 60 Hz and would look something like this (if you plotted current as a function of time).
Do fluorescent lights use AC or DC?
Fluorescent tubes are almost always powered with AC, but this circuit uses DC. Basically, this circuit is a voltage doubler composed by two 1N4007 diodes and two high voltage electrolytic capacitors of 10 μF 350 V. Such capacitors can be easily salvaged from compact fluorescent lamps.
Do ballasts convert AC to DC?
AC vs DC, 35W vs 55W Ballasts AC ballasts output AC power, while DC ballasts output DC power. With AC ballasts, you can expect longer life in both bulbs and ballasts.
Can tube light work in DC?
It works in DC. Even though the source of the tube light is AC there is an AC-DC converter which converts AC to DC and then the power is supplied to the tube light. Tube lights in our daily routine (eg above) work on AC. Basically in tube lights works under AC Sources.
Which is safer LED or CFL?
Due to the fact CFL bulbs are a type of fluorescent lamp they contain mercury, which is toxic and complicates the disposal of CFL bulbs. LED lighting is more energy efficient than CFL bulbs, as well as all other types of fluorescent lighting.
Do LEDs have longer lifespan?
Because LEDs are as much as 90% more effective than incandescent light bulbs, they have a much longer lifespan. This is because they have no working parts that will burn out or break over time. An average LED light is a very robust piece of kit.