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This varies depending on the color. Try driving them with a current source instead. About 5mA to 50mA should work on any LED. Using a voltage source will blow some colors, and not light other colors at all. Of course a current source is likely to be more expensive than a series resistor.
What else can I help you with?
What work resistor?
when a resistor is connected in a circuit it drop some voltage across it.when a circuit have large input voltage then by using a resistor of suitable value we get the desired voltage.
What is the current drop across the resistor?
The correct question is what is the voltage drop across a resistor or the current flowing through the resistor using Ohm's Law where Voltage = Current x Resistance
Is a resistor and a relay the same thing?
No, they are not the same. A resistor is a current reducer and a relay is essentially a switch (using low voltage to switch high voltage on/off)
How you calculate the polarity of voltage source across the resistor when two voltage sources are connected?
A: by using thevenin theorem
How would you connect a resistor in order to reduce an LED's applied voltage?
You could use the voltage divider rule to reduce the voltage. Using two resistors in series, the input voltage will drop across each resistor by an amount that is proportionate to the values of the resistors. If the 1st resistor is 10K and the 2nd resistor is 100K, the voltage drop across the 10K will be 10 times LESS than that of the 100K resistor. The total voltage drop across both resistors will be equal to the supplied input voltage. Work out the ratio of voltage you need from the total input voltage and use 2 resistors will that give you the same ratio. Connect the LEDs in parallel with the resistor the gives you the voltage you want. Use a MM to measure the voltage across the resistor before wiring LEDs.
What is equivalent wattage when different wattage resistors are connected in parallel?
In order to determine this, it will be necessary to find which resistor 'maxes out' at the lowest voltage. This can be found using the equation Vi=sqrt (Pi*Ri) for each resistor, where Pi is the power rating of resistor i and Ri is the value of resistor i. Once this is found, the power dissipation of each other resistor can be found using the equation Pi=(Vl^2)/Ri, where Vl is the voltage that maxes out the resistor which maxes out at the lowest voltage, and Ri is the resistance of each resistor. The equivalent power rating would then be the sum of the power dissipated across each resistor.
If a current of 2 amps flows through a 12 ohm resistor what is the voltage across the resistor?
V = (I) x (R) = 2 x 12 = 24 volts
How do you connect and measure voltage using a voltmeter?
with a voltomiter
How can a capacitor be charged without using a resistor?
A capacitor can be charged without using a resistor by connecting it directly to a power source, such as a battery, which provides a constant voltage. This allows the capacitor to store electrical energy without the need for a resistor to limit the flow of current.
When using series-opposing voltage sources?
of course...by connecting parallel resistor to it ,,so when v look from load end there will b a voltage as well as resistance same to that of voltage source..
What value resistor will you need?
To determine the value of the resistor needed, you would typically need to know the voltage across the resistor and the desired current flowing through it. The value can be calculated using Ohm's Law: resistance (in ohms) = voltage (in volts) / current (in amperes).
How DC is converted to square pulse?
The easiest way to convert the DC Voltage to pulse is simple astable multivibrator. This can be achieved either directly by astable multivibrator ic's or using normal transistor and resistor combination circuits or by using 555 as astable multivibrator.
