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How do you get two bright lights and one dim light without a resistor?
Wiki User
∙ 10y ago
1. Use 3 lightbulbs, with a 3 way switch.
2. Use 1 3-way lightbulb with a 3 way switch.
3. Use a diode in series with one bulb to dim it.
4. Use a silicon-controlled rectifier (SCR) with a simple circuit to cut out a certain percentage of each AC wave.
Wiki User
∙ 10y ago
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Explain the working of LDR and mention any five applications of LDR in detail?
A photoresistor, light dependent resistor (LDR) or cadmium sulfide (CdS) cell is a resistor whose resistancedecreases with increasing incident light intensity. It can also be referred to as a photoconductor.Applications:camera light meters, street lights, clock radios, alarms, and outdoor clocks
How is the brightness of the LED affected by different resistor values?
LED's are light emmitting diodes. diodes have a voltage threshold that must be reached for them to fully "turn on". A resistor can be used to limit that voltage. As the voltage drop across the diode is increased above the turn on voltage (typically .5 - .7 volts), the diode will emmit light. The LED will only light up so far, so by turning the voltage up significantly more will have a very limitted payback in light output.
What products use Variable resistor?
Toasters and lightbulbs.AnswerA resistor is an circuit component. So, while toasters and light bulbs have resistance, they are not resistors!
Why is a resistor used to operate an LED?
To calculate the current through an LED, use the following formula Current = (Source_voltage - Led_voltage_drop)/Resistance Now if you didn't use a resistor, the you only have the resistance in the wire, which is very small (eg .001 ohm). So if you have for instance a 9V battery, and a 2.1 volt drop across the LED, the resultant current would be so high, it would destroy the LED. We put a resistor in to lower the current to an acceptable range (often 20-30ma)
What products use Light Dependent Resistors?
security lights use resistors as the light out side falls the security light turns on and as it gets lighterbout side the light dimms and turns off, in bmw's the resistors are used to detect when the lights should come on as light gets brighter the car lights turn off.
What is light that is not bright?
Black lights are not bright but when you turn them on you can see certain special things that you can't see in a regular light.
What is the function of an LDR or a TDR in an circuit?
The function of an LDR or light dependent resistor is to change the brightness of the light based weather conditions or light hitting the object the LDR is on. When it is darker out, the light does not shine as brightly.
Which bright low lights are often used to light outdoor sports stadiums?
vapor lights
Which Bright glare lights are often used to light outdoor sports stadiums?
vapor lights
How bright should outside wall lights be?
Outside walls can be as bright as one wants them to be. Some prefer to have very bright lights to light up an area, while others prefer dimmer lights to accent a spot.
Why do moths fly in circles in front of bright lights?
they are attracted to the light ! :)
Which bright, low-glare lights are often used to light outdoor sports stadiums?
vapor lights
What does the name casady mean?
casady means [ light or shine &bright ] the meaning of casady is bright shining lights
Why are LED lights so bright?
Its because, LED light is usually in a laser light. Lasers are ussually bright, very bright. thats all, i know might be a lie. might not--
Slogan - turn lights off?
A catchy slogan for turning off the lights is "Be bright, turn off the light".
Are all lights bright?
it depends on the light, there are some that the eye is sensitive to and some that are not
Which bright low glare lights are often use to light outdoor sports stadium?
Flood lights are used as they are low glaring lights !
