How do you know the voltage of an LED?

70 views
How do you know the voltage of an LED?

By multimeter
+1 vote
by

After connecting led to a DC source we can measure the voltage of led by connecting a voltmeter across it.

But voltage rating of the led is given by the manufacturers. Or we can test it by observing the intensity of led. Basically there are 1.5 v, 5v.... are available in the market

For more doubts connect with me in linkdin

Related questions

What is the voltage of a red LED?

Why do dimmable LED lights flicker?

How do you fix voltage drop?

Draw the symbol of LED & photodiode.

Draw symbol of LED and explain it’s working principle.

List four applications of LED.

How do you know when a capacitor is bad?

To determine the polarity of the voltage drop across a resistor, it is necessary to know?

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is  (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

The threshold voltage of an n- channel enhancement mode MOSFET is 0.5V when the device is biased at a gate voltage of 3V. Pinch off would be occurs at a drain voltage of (A) 1.5V (B) 2.5V (C) 3.5V (D) 4.5V

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz

The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be

The voltage gain of a common -source JFET amplifier depends up on its  (1) Input impedance (2) Amplification factor (3) Dynamic drain resistance (4) Drain load resistance

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2) decrease progressively  (3) decrease to a minimum value at α = 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

Explain the pulse width modulation technique for control of AC output voltage.

How do you code an Arduino?

How do you test an SCR?

How do you reset an Arduino?

How do you power an Arduino?

What is the ripple voltage?

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

The internal resistances of an ideal current source, and an ideal voltage source are, respectively, (A) 0, ∞ (B) ∞, ∞ (C) ∞, 0 (D) 0,0

The magnitude of various voltage drops that occur in an alternator depends on?

How do you measure the speed of a motor?

Explain how sinusoidal AC voltage is generated by using simple one loop generator.

A voltage source inverter will have better performance if its  (1) load inductance is small and source inductance is large.  (2) both load and source inductance are small.  (3) both load and source inductances are large.  (4) load inductance is large and source inductance is small.

A voltage source inverter is normally employed when  (1) source inductance is large and load inductance is small (2) source inductance is small and load inductance is large (3) both source and load inductance are small (4) both source and load inductance are large

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

Is the power line voltage available in our homes a dc or an ac voltage?

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Self induced voltage across an inductance

An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS

An ideal voltage source has?

An ideal voltage source should have?

What is an analog voltage?

How do you create a function in Arduino?

How do you discharge a capacitor in a microwave?

How do you charge a capacitor with a battery?

How do you test a capacitor with a multimeter?

How do you test a triac?